how long does the school have to perform requested test?

IDEA give a 60 day time limit for testing from the time of the request. If they are denying your request, ask for a written statement of denial. Make sure you are making all requests in writing and documenting all dates, conversations, etc. If they refuse to test, you have the option of taking the request higher into the district management and can also request an Independent Educational Evaluation at public expense.

Did you make a verbal or written request? As it has to be in writing.
Also with a Date on it, and keep a copy for yourself.

FYI

60 business days. Not calender.

Here is an article about the Special education referral process. Hope you find this helpful!

http://www.schoolpsychologistfiles.com/specialEducation.html

also do school systems only have to test while you are still in college at the latest or if you are a resident in a town your whole life and want to be tested when you are in college do they need to?