My projected score was a 29-33, and I scored a 34 the first time I took the ACT (though I think I was a bit lucky).
As far as studying goes, you're on the right track by being on CC. Read the threads on this forum and its parent forum (SAT and ACT Tests & Test Preparation). You will find much great advice for ACT prep.
Here's a summary of what you should do over the summer:
1. Buy an ACT practice test book.
List of a few books:
The Real ACT Prep Guide (aka the "Red Book"): The only book made by the makers of the ACT. Contains tests that have been used for past test dates. Considered to be the most accurate.
Barron's ACT: Generally considered to be harder than the real thing, but it will make the real ACT seem a bit easier. I was actually using this book the week before I scored my 34, and I think it helped quite a bit.
Barron's ACT 36: I haven't used this one, but it's geared toward making you score in the high 30's (ideally a 36).
Princeton Review 1296 ACT Practice Questions
Princeton Review Cracking the ACT
Books without comments are the ones I have no experience with.
There's also a free e-book available on Sparknotes at http://www.sparknotes.com/testprep/
. It contains a few practice tests as well.
2. Take practice tests; identify the section(s) that you need to study the most.
4. Study some more.
5. Take a break. It's summer, and you have 2 more years to worry about the ACT. Besides, if you go at it too hardcore, you will probably just end up wasting time.
Finally, don't be too concerned about what you're scoring on the practice tests. Concentrate on identifying and correcting your mistakes. Even if you score a 36 on a practice test, chances are there is still room for improvement.