If you want to change your school grades permanently I suggest you contact the hacker that I hired when I desperately needed to change my transcript grades while applying for my Msc program. He did a perfect job on my grade change hack and the results were good enough to get me into the Masters program, deephacking17 also helped me retrieve my exam questions from my University's Admin just before my final exams and they were spot on and exact..
Make sure to mention my name as the referrer if you want him to respond because he is very picky with jobs (deephacking17-at-gmail-dot-com)