@Intercollege If you are working the process you have described in Posting #13, something is clearly wrong. As many of the previous posters have noted, you need to find a good tutor and show them copies of your exams. Some questions:
(1) Are you finishing the exam or do you have trouble doing the problems in the allotted time?
(2) Are you careless and make a lot of errors?
I find it very hard to believe that someone who is capable of scoring 1520 (which means minimum 720 Math) on the SAT can be failing Algebra 2 given how central that subject is to that test.
As others have noted, retake the class (not online) and get a good tutor and show them your homework and exams.
Is Algebra 2 offered over the summer at your school?