Without the diagnostic testing, you will not know what to look for in a college nor will the college know how to assist you. In addition, most colleges will require official documentation of your learning disability. Both the ACT and the SAT batteries can be given to you under untimed testing conditions. Your disability may be accommodated and your testing might more accurately reflect your academic achievement. For example, Braille, large type, audio cassettes are available for students with visual disabilities.
Extended time is available for students with dyslexia, hearing disorders, and other motor handicaps.
Ask your high school counselor for more information. Be certain to allow enough time before the school's application deadline as special forms must be completed and mailed to the College Board or to the American College Testing Program weeks before you can take the test. Testing may then be administered by a faculty member at your high school. A college cannot refuse you admission merely because you have a learning disability. On the other hand, they must ensure that by admitting you to their school that you will have a reasonable chance of success on their campus.