I had a brain tumour removed at the age of 16 and get straight A's in school. Will I ever regain pre-tumour brain functions?

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Before my brain tumour math was my best subject. I was always the smartest kid in my class and always got 100% in everything without even trying. After my tumour I was the dumbest kid in my class but I was still in the gifted program which is for people score in the top 2% on 6-8 hour i. q. tests so I was the dumbest kid in the gifted program. Now I am university and getting straight A's but I think I work 6 times harder than you average student and I am only a part time student. I'm religious and I pray everyday for God to restore my brain and I think that he is but I don't know how long it will take. I've grown 3-6 inches in the last 9 years and I hit puberty about 17 years ago so medically speaking I'm not supposed to be growing anymore.
I had a brain tumour removed at the age of 16 and get straight A's in school. Will I ever regain pre-tumour brain functions?
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