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Internet and Social Media: This is one of the best ways to help you prepare for JEE Main without coaching. Internet and Social media platforms like Facebook have emerged as an important medium connecting JEE aspirants. 

JEE Main Mock Test And Previous Year Question Papers: To improve your performance and crack JEE Main without coaching, taking mock tests and solving previous year question papers is a must. Both - JEE Main sample papers/previous year questions and JEE Main mock tests would give you an idea about the type of questions you can expect in the exam, it would also give you how to manage time.

Books play an important role if you want to qualify JEE Main with a good score. And since you would be preparing for the exam without any coaching classes, choosing the right set of books becomes vital. Speak to seniors and candidates who have cracked JEE Main previously, about the best books for JEE Main. Go for books which are a good blend of theory, solved examples and questions. Also, NCERTs are essential for JEE Main preparation. 

Hope this helps. All the best!