Following some useful tips will make JEE Main exam an easy ride for candidates. Some of the valuable tips for JEE Main prpearation includes management of time, focusing on important topics and chapters depending on the weightage. In addition, students should practice sample paper and take mock tests. 

1) Candidates should make a time table to beat the exam pressure and adhere to it. They should complete the syllabus a month before the exam so that they have enough time to practice the sample papers and revision.

2) Students must be well-versed with the syllabus of JEE Main 2019. They should know the important topics from which questions will be asked. 

3) Students must refer the right reference books for preparation. 

Dear student.

Greetings.

Facing a mental breakdown during preparation for JEE main is quite normal. A lot of people take stress during preparation. But, only a few of them manage to take that stress in a good way and use it to enhance their preparation. You need to understand the fact that overthinking and anxiety won't help you in securing good marks in JEE main examination. So, you need to stop fearing the examination and start working hard to build confidence.

Thank you. All the best.

First thing first its okay if you haven't enrolled to a coaching institue. Focus on your 12th right now. It is more important also first comes your own well being. The way you are asking seems like you are already stressed about it so just calm down take deep breathes and take it easy. With time you will figure it out.