Dream big! Your dream is an example of such.
Now you need to get clear the examination pattern and details.
The link below will provide all details.
https://engineering.careers360.com/exams/jee-main

Go to this link and know the details of the exam.

Regarding the preparation you must get your covers created in the subjects, keeping in mind the topics which are frequently asked in the exam.
Solve previous year question papers.
And always solve MCQs within a time bound environment.
Unless you solve MCQs quickly you can't score well.

You can also go for a coaching institution like FIITJEE, AKASH, RESONANCE, ALLEN etc.

Distance Learning Programmes are there for students can't attend the regular classes.

Just keep your mind straight, be focussed on the exam and have enough rest to stay active.
Best of Luck.

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