SSLC exam tips please!!

Hi, I am in 10th std and I'm studying in State board but i didn't find any community for that specifically so i thought I'd try here, sorry. So, in my last exam for Half Yearly, I scored a total of 353. My aim is to atleast get 450 but I'm not able to. Please give me some tips to score more( in any of the subjects), or anything regarding the examination. It would really help. Thanks anyways.