I didn’t take any ACT practice tests at all. I had a look at one of the practice tests online, and from my initial reaction (after skimming through the questions), I decided that it was not the test for me. Remember that the sooner you decide on taking the ACT/SAT, the sooner you can practice.
You mentioned that the ACT sitting date was in September? This is good for you as it allows you to get the main test done and out of the way. Then you can concentrate solely on the SAT II Subject Tests. My advice to you would be take the tests only when you’re ready - I know your schedule is tight, but don’t rush off unprepared and unready. You have plenty of time to prepare for the September ACT (I’m assuming you’re on summer holidays, up in the Northern Hemisphere). You’ll be wanting to break the 30 mark, if you’re aiming for a Top 30 school. If you’re looking at Top 20, it would be ideal to hit the 34 score (or higher). I’m not sure if it’s pragmatic to jump for a 25 to a 34, but these things can happen, so continuing practising.
I’ve never taken an ACT test, but I’ll provide my approach to the SAT I, which might be useful for you as well:
- Familiarise yourself with the content (e.g. Maths rules, grammar rules, etc.) - you wouldn’t go into a chemistry exam without knowing what you’re being tested on, so why wouldn’t you do the same for the SAT/ACT?
- Now take another practice test - hopefully, you’ll see your scores increase a bit. You can’t expect a too high of a rise, though. At this point, you can set a goal that you think that you can realistically achieve.
- Identify your strengths and weaknesses. Let’s say you got the scores that you mentioned in your first post. Reading was a major weakness, and the maths section was your strength. Assuming that your goal was a 31, then you would probably want to work on your weakness first. Do reading drills (just use the reading sections from the practice tests) - make sure you know what you’re doing first, though; you don’t want to be aimlessly doing questions just for the sake of doing questions. I’m not sure how similar the reading section of the ACT is to the CR section of the SAT, but the CR section is quite difficult to improve on within 2-3 weeks (my CR score only increased by 60 points). Again, I’m not sure how the ACT scoring operates, but you don’t necessarily have to get the reading score over 30 (the higher, the better!) - your strengths (e.g. maths) might be able to compensate for your weaknesses.
- After the reading section, it’s up to you to decide which one you need to work one. I would probably go for the maths section and try to bring this score up to 34+ (this shouldn’t take too much effort, hopefully). However, if you find that your maths score is naturally increasing in your practice tests, then don’t worry about focusing on the maths section. Move on to the other sections.
There are obviously other (and arguably, more important) techniques which I used to improve my SAT, but I don’t have the time nor the space to go through them here. What I can say is this: work smarter. You don’t necessarily need to spend months practising - I worked smart (i.e. found shortcuts to maximise my SAT practice) and saw my score increase by 250 points in about two weeks.
Now SAT II scores. Remember that these scores generally play a small role in your applications. The main test (SAT I/ACT) will ultimately decide whether your application gets looked at (at top universities, at least), however, the SAT II Subject Tests only supplement your excellence in your passions. Are you applying for engineering courses? If yes, then I highly recommend that you get your Math II as close as to 800 as possible. If no, then a 750 will suffice. Physics - get past the 700 mark, ideally 750+ if you’re considering an engineering or a science major. Take these in October, and retake in November, if you need to.
Now, regarding Georgia Tech: get working on your application in August. Don’t start your application (inc. essays) after you finish your testing, otherwise you’ll be running tight on time. The same rule “time rule” applies here as well: if you’re not ready to submit your application (essays, test scores, etc.), then don’t submit them in EA. If you get outright rejected, then you won’t even be able to apply RD. Of course, it’s statistically harder to get in through RD, but you don’t want to be rejected in EA if you weren’t happy with your application. Apply when you’re ready and happy with your application.