How to get college application fee waivers:
Eligible students in the class of 2015 who tested during the 2013-14 academic year can access fee waivers from My SAT at the beginning of their senior year.
Seniors
testing for the first time during 2014-15 will receive college
application fee waivers from My SAT when they receive their SAT test scores online —
typically 19 days after the test date.
Using college application fee waivers:
To have a college application fee waived, students must submit their
fee waiver to the college they are applying to (NOT to the College
Board).
Most colleges and universities define eligibility for a
college application fee waiver as being eligible for or having received a
fee waiver for a test such as the SAT or an SAT Subject Test,
participating in the National School Lunch Program, or receiving public
assistance.
Before using a fee waiver, students should check to see if the college will accept it.
Colleges that cooperate with the SAT Fee-Waiver Service are not
obligated to waive their application fees, and some may require
additional information before considering or granting a college
application fee waiver.
source:
https://satresourcecenter.collegeboard.org/college-application-fee-waivers