lol thats a really vague question.
ok since you wanna check out UCLA, go to Welcome to ASSIST
and fill out everything and once you have that, that will tell you all your major pre-reqs.
in order to go to UCLA you must finish IGETC and (depending on major) major -preqreqs. IGETC can be found below http://www.mtsac.edu/catalog/2009/section09.pdf
theres IGETC on page 8.
i would suggest applying to mtsac, if you havnt already. take your placement tests
then get your registration date, take summer class if at all possible, and continue your education from there. Join the honors program, be an active student (IE clubs/programs/student gov), show that you have matured as both a person and student and i think UCLA and columbia can be within your reach.
UCLA is much more attainable than Columbia (i think). Both are GREAT schools. my psych prof got her PHD from columbia, what is your major btw? im guessing architecture?
once you are in the honors program, get an appointment with LINDA DIAZ, ASAP. when i say ASAP i cannot stress that enough. she is usually ALWAYS booked for weeks. so do so immediately once you are in honors. she will help you MUCH more than i can. she can def help with with columbia too. im not too familiar with privates aside from USC.