JEE Main

For JEE main, NCERT will be really useful. Other than that, try:
1. HC Verma for physics
2. RD Sharma for maths
3. P Bahadur for physical chemistry
4. NCERT will do for organic and inorganic chemistry (along with some coaching modules if you can get them somehow)
5. This is really important: Do not forget to do previous year papers and some sample papers based on current format and syllabus. It helps a lot. Really.
It will be a really daunting task to finish off your preparation in 5 months alone because if you haven't had the motivation to start preparing till now, then it is going to be so tough, trust me.
Now let's plan your schedule so that you can finish all of the above in time (if you can finish all of the above books easily and master them, and also get a 90%+ score in board exams, then you, my friend are a stud. If DTU or BITS is your dream college (assuming you are from Delhi), then nothing will be able to stop you from getting an admission there).

The tips to prepare for JEE Mains at home.
1. Have Well Planned Study Chart: Having a well described study program can help you know the number of topics to be covered in a subject on a particular day.
2. Frame time table for study: framing time table is the best practices to keep your daily activities divided b/w Two needles of the watch.
3. Focus on important and key topics: paying more attention on what are more important topics in each subject from the examination point of view, can help you streamline your study pattern as well and eventually secure better marks in the exam.
4. Know your weak area: knowing your weak areas will help you turn into your strong areas if you are determined to do so. Do not take any subject or topic lightly.
5. Can do crash course.
6. Solve previous years' question paper.
7. Writing practice.
8. Avoid Distraction.
9. Stay fit and healthy.
Best of luck.

The tips to prepare for JEE Mains.
1. Have Well Planned Study Chart: Having a well described study program can help you know the number of topics to be covered in a subject on a particular day.
2. Frame time table for study: framing time table is the best practices to keep your daily activities divided b/w two needles of the watch.
3. Focus on important and key topics: paying more attention on what are more important topics in each subject from the examination point of view, can help you streamline your study pattern as well and eventually secure better marks in the exam.
4. Know your weak area: knowing your weak areas will help you turn into your strong areas if you are determined to do so. Do not take any subject or topic lightly.
5. Can do crash course.
6. Solve previous years' question paper.
7. Writing practice.
8. Avoid Distraction.
9. Stay fit and healthy.
Best of luck.