In order to improve in your math skills you have to study.
I know from experience.
You can get a tutor like I did. Some help some dont so choose wisely.
You should print out worksheets from online, if you dont have a printer just copy the question onto a piece of paper.
STUDY!
Everyday when you come home from school, review what you have done during math class so if you forgot some of it you refresh your mind. Do the same thing before you go to sleep.
Hope I helped!