Yeah, colleges don't see the AP credits until you request that ETS sends it out (which you should do only after you've decided what college you're going to, since it costs money). Oistrakh, I don't know what colleges you're applying to, but just remember, Ivy Leagues aren't the alpha and omega of colleges. Go to whatever suits your needs (and your budget). There's no point going to Harvard for engineering, as Georgia Tech has a far better engineering school and will cost far less (just to give an example). However, for liberal arts, as good of a school as Tech has in that, Harvard would be the better choice.
You'll all be fine, as long as you have kept up with your material during classes and have been a diligent (not amazing, just work hard) student through the year, you will do well. As far as study materials go, I've had great luck with the Barron's series of review books. Use them to great effect. Also, for those out there that aren't juniors and seniors, you don't need to take every AP your school has. The critical ones that I highly recommend are English Lit/Language, Calc AB/BC (if your school offers BC that is), and Chem/Bio/Physics C (once again, not necessarily all, check your major requirements at prospective colleges first, since not all will be needed for every major). Other than those, take AP's as you wish to get you along your prospective major path. There's not much point taking 100 history AP's if you are planning on going into Aerospace Engineering, so just be smart about what you take.
Aditya