Hi dear,
Firstly you should analysis yourself and start with basics.choose the topic which contains maximum marks and easy such as matrix, probability,calculus.Solve previous year paper because some questions may be repeat.if you are not able to understand the topic then try to take help with teachers.Analyse the previous year question paper because questions will come with same pattern.Practice more and more.Stay cool and calm.Do some yoga and meditation.
Thank you
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