How can I be prepare for boards n jee mains from now???

You can follow below strategies for your preparation

1- Timetable-  You should make a proper time table for your preparation and include both the syllabus for JEE Main and boards exam and make sure you get enough time for preparation.

2- Focus on theory and concepts- You should clear your concepts to score good marks and to build strong fundamentals.

4- Complete your syllabus- You should complete your syllabus and focus on the topics which carries more weightage in the exam.

5- Previous year papers- You should solve past year problems to analyze the exam pattern and to understand the level of questions.

6- Revision- There are some important  topics in the JEE+Boards syllabus that require students to learn  by rote, like trigonometric identities and  inorganic chemistry- this is where regular revision will help you.  In Board Exams, you are required to write theoretical answers. Regular revision is the key to scoring high  marks in Board Exams.