"Ncert devo bhava"....Complete word to word ; line to line reading in Ncert..watch videos on youtube from channels like biomenters online.;Examfear to understand the concepts mentioned in the book..;Then refer previous years question papers from channels like Meditone.Try to solve Exempler books problems...After doing all these things give a test...; just be calm , read the question twice ..& underline the words like correct;incorrect;false;true; etc in the question so that u may not be mistaken abt what is being asked in the question ...as if u misread such words u can do a -ve attempt...so remember underlining such words....& go through every option ..when u feel sure & satisfied ...then only u mark ur answer....by this u will reduce ur -ve attempts in ur exam paper....