Here are some of the preparation tips to get score well in your Boards:

Complete the syllabus: Start with the NCERT books and go through well with the books as it will no only help you to score well in boards but also will help you for the competatives exams.

Follow Proper Schedule: Make your time schedule for your study & daily routine & follow it properly.

Mix and match: Don’t take all the easy subjects first or last. Mix both of them. Start with an easy subject so that you get warmed up and then study the difficult topic/subject.

Solve sample papers: Keep Solving CBSE Sample papers each day. Pick a different subject for each day. After solving do analyze yourself like your weak areas.

Revision: Afetr completing one chapter do revision as it will help you to get memorise whatever you studied.

The most important be confident.

Good Luck!