Hello chokroborti

No, you don't have to worry about the gap, as you can give your examination on thr basis of other eligibility rules.

NEET doesn't depend upon the gap, if you have completed your 11th and 12th with subjects required by the NEET examination, you are eligible for the examination.

You need to have PCB,PCMB as your main subjects to be eligible for the neet.

Best of luck

I hope it helps