You should be determined to score good marks in your boards exam and you should prepare accordingly. 

Your concepts should be clear if you are facing any doubts make sure you clear it 

You should focus on important topics which carries more weightage in the exam. Make your important notes which will help you in revision at last momemt of time. 

Solving previous year papers are very important to score good marks and to know the level of the exam. 

All the best for your boards exams!!