Hello,
The task is easy,
try devoting as much time as possible, prepare from legit books, prepare from previous year question papers. Since you are preparing for boards, try solving all past 10 year question papers. You can try to solve some other refernce books, such as that for JEE. lay more stress on exemplers and the sample papers released by the official board. try solving easy and short topics first. Analyse the weightage of each chapter and prepare in a descending way. keep revising and solve atleast one paper per week. mark important question for future reference.
hope this Helps
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile