Hello there!
Greetings!
No , there will be no problem , you are eligible for neet even if you have 4 year gaps between your 10th and 12th as to be eligible for Neet the condition is that a general category student needs to have passed class 12th with 50 % in pcb aggregate,  while it's 40% for obc , sc, st.  So , if you fulfil this with criteria then you are eligible for neet,  also there's no upper age limit for neet so you don't need to worry about that as well.
Prepare well for neet.
Thankyou

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