Also please tell me that this 1 year gap will matter or not for neet prospective?
No, the gap doesn't matter. You just need to give a recent character certificate signed by a gazetted officer at the time of admission. You'll have to mention in that character certificate regarding what you have done during that gap period. It's more of a formality sort of thing to submit a character certificate. But the gap won't affect anything.

The gap doesn't matter. You can appear for NEET any year till the time you reach the upper age limit set for giving NEET. Gap year doesn't matter neither while appearing in NEET nor during counseling.
As per my knowledge, your 12th passing certificate will have that year printed on it, in which you passed 12th and not the one in which you failed. So this won't become gap year.
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