If your grade is suffering there is only one thing left to do. No, not Extra Credit or re-taking the class or giving up. All of those are horrible decisions. Instead, you need to hire a professional who knows what it takes to make the grade. Improving your grade is something instructors want to do, and are forced to do at times. But, they will not do this if you keep handing in the same bullshit. Let a professional craft a masterpiece so your instructor has no choice but to improve your grade.
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