I’m a sophomore. 203 on PSAT: Math: 79, CR: 57, W: 67 (without studying).
I really like science and math and am terrible at reading and writing, so I’m leaning towards the ACT.
Tips please? to improve reading?
If I studied this summer, is that enough time to take it in September? I’m aiming for top universities so yes, I will definitely be cramming this summer for the ACT.
Thanks guys 
You should always take both to find which one suites you better. Studying over the Summer should work, if you keep a consistent schedule to practice and take simulation exams.
There are plethora of tips just here in this sub-forum, along with tips to get a 12 on the essay (ACT).
Good luck.
I would take at least both. You won’t truly know how much you’ll prefer the ACT over the SAT, until you take both. You got a great PSAT score. ACT still has reading and writing, but I did find it easier than the SAT. If you studied this summer, then yes you would be fine to take it in September. However, most people take each test 2 or 3 times. Most colleges superscore the SAT. It’s good you’re taking initiative your sophomore year. I wish I did that. Best of luck! If you have any questions please let me know!
The ACT English sections are very easy, so I would highly recommend you take that since you are so strong in math.
If you can afford to take both, do so. If not, get a practice test of each, and take each one under testing conditions (timed and in a quiet place). See which one you do better on, and then take that one. I would definitely recommend finding the time to take your standardized tests in junior year. Wish I had done that.
Good luck! With those PSAT scores, I’m sure you’ll do really well.