So I took the SAT using a fee waiver so the College Board gave me four application fee waivers.
However I want to apply to six colleges and two of the colleges offer their own fee waivers. Can I apply for college-specific fee waivers or am I limited to using only the four that I got from the College Board?
You can use a combination of fee waivers.
Some schools offer free applications if you apply online or by a certain date, some if you visit.
If you apply to common app schools your GC can verify that you qualify for fee waiver and then all schools you apply to with common app should be covered by that.
And then there are the fee waivers through college board.
You also get four free score reports sent to colleges for each SAT you use a waiver with