Whether you'll get burned out or not, who knows (if you're like me you probably will).
But what I'm sensing from the question is the idea that if you do enough full prep tests, that will make you better at the test. This is simply wrong thinking. You don't get better at math tests by racing the clock on a bunch of practice tests. You get better by taking your time and (slowly, deliberately) playing with the numbers and the formulas until their mechanics become second nature. THEN you go back and ace the test.