main avi 12th me hun 3 month baki hai board exam ko main mbbs karna chhti hun avi se neet ki tyri karun ya board exam ki samjh nhi aa rha plzz help

Hello dear,
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Firstly complete your 12th with good percentage. Because if you don't get the percentage above 50%  then you are not eligible for attempting NEET.
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Your 10+2 syllabus will cover 1/4 of the Portion you will be preparing for NEET. So, if you do your 12th with concentration,it will be easier to go for other 3/4 of the  portion.
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Now, if you have a confidence of handling both the syllabus and getting passed out successfully then only go for preparation.
Or once you complete your 12th examinationa syllabus, go for NEET preparation.
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I am helping you with a link which will help you with the best books for NEET preparation. Books mentioned here will be more enough for completing preparation.
https://medicine.careers360.com/articles/best-books-for-neet
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Hope you know the dates or else here I'm helping you with the details.
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• Application notification, August 21
• Application release, December 2
• Last date for registration, December 31
• Correction starts in January
• Admit cards, march 27
• Exam, may 3
• Results, June 4

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Best of luck