I have a C in Algebra! How do I bring it up to an A in 2 weeks?

Okay, so I'm 13 and in 8th grade and I have an 84 in Algebra. My parents and I agreed that if I get all A's this marking period, I can get the iPhone 5 for my birthday in June. The marking period closes in 2 weeks and we get report cards April 19. How can I bring up an 84 to a 93! Thanks (:

Added (1). We have 2-3 more tests to take and we have about 4 quizzes left to take. Also, we have homework everyday.

You may not be able to. How much homework and tests are you going to take in two weeks. It will depend on how many points those are worth towards your total grade.

Extra credit.
Turn in any missing assignments (if your teacher allows late papers)
Don't lose any more assignments.
Hope your teacher gives enough work before grades are due.
You sound smart, the more work you get the better the odds you can bring that grade up.

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