Hello Mukul,
Seeing that almost half of January is over, now you have almost 1 and a half month left with you. We keep the rest of the time for revision. In this time preparing for board is quite easy, provided you have a good strategy and good work schedule.
Firstly find the syllabus for the exam. Write it down and prepare a check-list. Write each topic. Find relevant guides and books. Generally books for boards are quite big and detailed. You don't need those, find brief books like that of NCERT. Start preparing topics by topics and target to finish all the topics in 1 month. Start by easy topics, dedicate equal time to all three parts physical, inorganic and organic. Find more frequent quesitons and prepare them first. in organic, reactions such as named reactions, preparations and that with commercial applications are very important. In physical some topics are very important. And in Inorganic the learning topics should be prepared consistently.
After you prepare all, leave the book and practise the previous 10 years papers untill you get perfect in this subject.
Hope this Helps
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