Dear Gurujeet,

First, you should try to score good marks in your exam so that your one year is not wasted. There are some companies as well which cosider your gap at the time of placements. 

If you are dropping a year for JEE Main make sure you make it worth.

You should be determined and self motivated to crack your exam. 

Try to get admission in top NITs to get good teaching and placements. 

If you are dropping a year you should make proper strategy to crack your exam. You should make your time-table. You can set your targets on daily basis and for weekly as well.So, that you can complete your syllabus on time and you get proper time for revision.

If you want to score good marks in JEE Main make sure your basics are clear. Make sure you read NCERT books throughly. So, that you can solve tricky questions easily.

You should be aware of the complete syllabus, exam pattern and important topics.You should complete your whole syllabus and focus on important topics more. You can solve as many as MCQs. For exam pattern and to know level of questions you can refer previous year papers.

Solve complete mock test series to work on your time management and to increase your speed. With the help of mock test series you can analyze your preparation level and you will get to know your strength and weakness. So, you can work upon them.

Revision plays very important role in scoring good marks. You should revise your syllabus properly. You can make your important notes as well which will help you in revision.

Good Luck!!