U can take help from ur teacher or friends.
and try the sums at home because self study is the best study. try to do at least 10 sums each day and ask ur teachers for help if u have a doubt. 
if nothing works for u, u can see some youtube videos of maths(example- if u have a chapter algebra and sums on it, search for some algebra videos and see it)

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Try hard until u reach the goal
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