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One of the key parts in preparing your college application is knowing the key difference between the two standardized tests. One of the most common questions among students is ‘Should I take the ACT or the SAT?’. You might hear a bunch of different ideas about this test – that certain schools have a preference for the SAT vs ACT, that the ACT is easier, that your parents took the SAT, etc. None of these things are strictly true, so you should make sure that you spend some time weighing up the pros and cons of the SAT vs ACT.

Should I choose the ACT or the SAT?

Ultimately, the answer to this is up to you. Different factors may make the SAT or ACT the best test for you. For most students, the amount of practice they do is much more important to their final score than whether they choose the SAT vs ACT.


I took a diagnostic test – what do I do with the results?!

I took a diagnostic test – what do I do with the results?! published on


Many people start off their prep by taking both tests, or a diagnostic test. If you’ve done this, this article will help you work out how to interpret your results. I know that many diagnostic tests provide some interpretation of their results, and some guidance about which test you should take based on your results, but here’s what I would say to you if you’re trying to interpret your diagnostic test, or your scores on a practice ACT and SAT.


What even is a diagnostic test?

Diagnostic tests are basically shortened versions of a real test. They contain all the same types of questions as the real tests. Some companies sell these as the introduction to their prep schemes. This is definitely a good idea, but you should also know how to get the most out of the test.

A warning: My biggest concern about diagnostic tests or just taking both the SAT and ACT without studying is that there are many things that can cause your score to be a poor reflection of your potential score if you’re unprepared for the test. You could forget a small formula, for example. You could miss the point of a whole passage just because it wasn’t what you were expecting. Mistakes like this will make your 4+ hours writing the tests completely useless. You should absolutely definitely familiarize yourself a little with the tests (2-4 hour study on each one) before you rely on a score from a diagnostic test. This is not common advice, but I strongly believe in it, and it’s what I do with all my students.

Some pointers for starting your study:

  • Look at the summary sections for the ACT and SAT.
  • Know how much time you have! Be aware that the ACT reading and scientific reasoning are tough on time
  • Practice ACT Scientific Reasoning. It’s different to anything you’ve seen before. If you’re trying to figure it out in the middle of your diagnostic, you’ll do worse than if you know about it beforehand
  • Get some formula sheets for the Math sections – or make one from your math notes. You need to know things like slope of a line, area of triangles, sine and cosine law etc
  • Expect data based reasoning on the SAT Reading. It can be a little weird the first time you see it, but you’ll get used to it


I’ve already taken the diagnostic, what should I do?

Firstly, compare your scores. I’ve got an article that nicely explains the College Board’s concordance table (currently the only thing that you can use to compare scores). You should note that the ACT has officially disagreed with this document, but right now it’s the only thing out there that compares the ACT with both the old and new SAT.

If you score much better on one test than the other then your decision is easy. I would define ‘much better’ if your ACT score is more than 3 points higher than your converted SAT score, or if your SAT score is more than 80 points higher than your converted ACT score. If, like most students, the difference is not that large, then you really need to consider which test you prefer, or which you’d find easier to study for.

If you’ve found this helpful, I suggest you read my comparison of the ACT and SAT to give you more information.

How do I know whether I should take the ACT or the SAT?

How do I know whether I should take the ACT or the SAT? published on

How should I choose whether to take the SAT or ACT?

First things first: despite what you may have heard, it doesn’t matter to colleges whether you take the SAT or ACT. All schools accept either test, and neither test is preferred (some schools are also test-optional – check out their website admissions pages). Some schools are not accepting the SAT for students applying in 2017, because of the format changes, but this won’t be a permanent move. A few schools accept the ACT instead of subject tests, so that’s worth knowing too, before you make the decision.

Neither test is actually easier, but some suit different students differently. There are some key facts that make a difference between ACT and SAT, however. As a rule of thumb, the SAT is better for strong Math students, because half your score is Math based, compared to a quarter of your score on the ACT. The ACT is better for strong readers, because the Reading and Scientific Reasoning sections both rely heavily on fast and accurate reading comprehension. Don’t make the decision just on that basis though, there are other factors.


take the SAT or ACT questions choice decide prepare study
It’s a big choice!


Here are the factors that help my students to decide whether to take the SAT or ACT:

The ACT… The SAT…
Only asks vocabulary questions in context, and usually less than 2 per test The new SAT will not test vocabulary, except in context, like the ACT (the old SAT did).
Contains a science section – you do not have be studying science to do well on it, it’s more about drawing conclusions from information. I’d call it ‘data-based reasoning’ Contains data based questions in Math, Reading and Writing & Language (basically everywhere!).
Has 4 sections plus optional essay at the end Has 4 sections plus optional essay at the end
Total test time is 3 hours 25 minutes Total test time is 3 hours 30 minutes
Extensive documentation needed to get testing accommodations such as extra time Accomodations often approved automatically based on what you get at school
Has one math section Has two math sections, making up half your score
Essay is 40 mins to discuss a “current issues” type topic, based on perspectives given (new structure as of Sept 2015) Essay is 50 minutes to analyse a persuasive text.
One math section, for which you can use a calculator Two math sections, one without a calculator
Requires you to work very quickly for the reading and scientific reasoning sections Has a much more generous time limit for reading comprehension, although you do have an extra passage to read. Also the passages are slightly harder – of the 5 passages on the SAT, usually 2 or more were written before 1900.
Contains more curriculum based math – some of the questions will look more familiar to you Contains much more data/statistical math than the ACT.
No penalty for getting wrong answers, so you should fill in every circle on your bubble sheet. Also no penalty (note that this is a change from the old SAT).


You might already have an idea of which test you prefer, based on reading about the difference between ACT and SAT. To really know for sure, you should get a practice test for each, and take the SAT or ACT under timed conditions and compare them. Diagnostic tests work for this too, but they are often made by prep companies, so they are variable in quality, and never as good as the real thing. They also may be shorter than the real test, meaning that you’re less likely to feel the test fatigue that you do when your take the SAT or ACT for real.

If you’ve done this, and got results from both tests, you can read about how to compare them here.


Here are the main points I would ask my students to consider when choosing whether to take the SAT or ACT:

  • Did you prefer the timing of the ACT or SAT? You can only really know the answer to this question if you’ve done the full tests. For the ACT, the reading and scientific reasoning sections (third and fourth in order) must be completed at a fast pace. This means that you’re working faster at the end of the test, which may not be ideal for you. On the SAT, the reading is first, and takes 65 minutes. Math is at the end of the test.
  • Do students in your area mostly take the SAT or ACT? In some places, most students take the ACT, whereas in other areas, it’s the SAT. If, because of where you live, you have easier access to help on one test or the other (tutors, prep programs run at your school, or just friends to ask for advice), that is important to consider in your decision.
  • Which test did you enjoy more? You’ll do better on the test you feel more confident with. You’ll also be more motivated to study, especially if you’re doing all your prep by yourself.
  • Math represents half the SAT, but only a quarter of the ACT. If you’re a strong mathematician but aren’t so good at reading fast, the SAT is a good test for you. If you can read fast, but your math isn’t so strong, the ACT is better for you. ACT reading is quite well correllated with ACT science (as opposed to science scores being similar to math scores, as you might expect).
  • Writing and Language (SAT) is virtually identical to English (ACT). So you have to do that regardless – it shouldn’t be a factor in your decision to take the ACT or the SAT!
  • Although the essay portion represents a big difference between ACT and SAT, I wouldn’t make it a factor in your choice. Usually essay scores do not matter as much as the test score itself, because universities have lots of other ways to assess your writing ability.


Don’t spend too much time picking a test. Some people just write both to see which they do better on. There’s nothing wrong with this, it just takes more time. If you are going to decide on one test, bear in mind that the ideal timescale for prep for either test is 6 months or more, so make sure you’ve made your decision at least 6 months before you plan to write the test for the first time. I said first time because I strongly believe you should write a standardized test more than once to maximize your score. Here’s why.

Good luck in your choice!! Comment below and let me know how you decided whether to take the ACT or the SAT.