You need to devide the time properly & firstly I would suggest you to focus more on your boards now as it will help you for both of the exam. Here are some important tips you can follow for the exam preparation.

1. Know your Syllabus Well: Check on the full syllabus of JEE Main 2018 before laying out your schedule for the upcoming studies. you will be able to know which units and topics are to be studied under each subject.

2. Work on a Time Table: Work towards creating a perfect timetable which will fit your schedule while leaving enough time to prepare for the examination within the days left. Make sure to add short and sweet breaks in between for some relaxation.

3. Make your Basic Concepts Strong: While it is essential to study the topics mentioned in the official syllabus, it is also advised to study the basic concepts well first. By knowing the basic concepts of the units involved in the examination, you will be able to understand each topics well and in depth. This will result in a greater understanding of the topics and will make it simpler for you to study complicated concepts present in the syllabus.

4. Improve your Weak Points: Stressed over some topics or formulas which you just cannot seem to understand? Give more time and focus on these topics to improve it. Keep small notes and constantly revise those concepts which has been hard to understand. By constantly studying the topics you find difficult, you will be able to be well prepared in them for the upcoming examination.

5. Write Notes and Prepare Flash Cards: Notes written in small diaries are highly accessible and you will be able to study from them anywhere anytime. By writing down those complicated theories and formula and revising them, you will be able to remember and understand them more efficiently. Similarly, create flash cards to help you with quick studies and revision.

6. Attempt Mock Test and Solve Sample Papers: Mock tests will give you an almost real experience of how the examination will be. By solving mock tests, you will be able to work on time management while at the same time understanding the question paper pattern. Similarly, sample papers will let you practically apply all of the topics you have been studying till now. Preparation using mock test and sample papers will let you know how much syllabus you have covered and where you will need to work to improve.

Good Luck!

In order to prepare for JEE Main along with boards exam you should be aware of the full syllabus. Focus on concepts and build your fundamentals strong. You can take help of NCERT books for your preparation. You can make your proper time table. So, that you can complete your syllabus on time and you have enough time for revision. You should set your daily targets.  You can refer previous year papers to understand the exam pattern and level of questions.

Revision plays a important role in scoring good marks you should do your revision properly. Focus on important topics you can also solve as much as MCQs for your practice.

You should also solve complete mock test series to analyze your preparation level and to know your strength and weakness. So, you can work upon them.

All the Best!!