give any time table for preparation of both board and mains from now onwards for only 4 hrs I'm not preparing for 2nd term my 11 is not good

You should make your own time-table for your preparation according to your suitability.

You can follow below point for your preparation

1. Focus on concepts & theory

While JEE Main is about practice, board exams are about theory.

2. Revise thoroughly

In board exams, revision is the key to scoring marks. Its also important for JEE Main that you remember all the formulae so that you don’t miss on the easy questions. There are some aspects in each subject which need to be learnt by heart and revising it thoroughly can help you fetch easy marks. If you have a time constraint, prioritize the chapters with maximum weightage in JEE Main, which you have already covered and make sure that you revise them.

3. Have a Plan

Strategy is key to competitive exams’ preparation like JEE Main. Use the time for preparing for board exams to optimize your JEE Main preparation. A structured and detailed plan will not just help you focus but will also enable you to see the entire syllabus in one go and then break it down piece by piece. Here, you should be extremely careful not to exaggerate your abilities to complete topics. Be very practical and create a plan accordingly that satisfies boards as well as JEE Main preparations.

4. Complete the Syllabus

Make it a point to go through the entire syllabus thoroughly without missing out on any topic. Many students tend to leave out topics because they think they are too easy or too difficult or because they barely have time. Start your preparation early so that you have time to complete the syllabus. JEE Main has questions from all the topics. Make sure you touch every aspect of the syllabus regardless of what you think about them (easy or difficult). This approach will help you ace your boards as well as your JEE Main exam because you will have studied everything clearly.

5. Understand the pattern

Having a thorough understanding of the question paper pattern is a must. JEE Main follows specific paper patterns that can be understood & strategically used to score well.

7. Practice Previous Year Papers

Practice previous year test papers of JEE Main will help you polish concepts that you are not confident about and get into the real groove of the JEE Main.

8. Take up a Test Series

Studying with the help of a test series will also help you focus, understand your weak points, and augment your studying methodology accordingly.