Hi Subham,

As per NEET eligibility criteria, there should be two years of regular and continuous study of Physics, Chemistry, Biology/Bio-technology taken together shall be required at 10+2 level for all the candidates. So there should be no gap between 11th and class 12th. Rest you seem to be eligible to apply for NEET 2018.

So if you have passed 12th in 2015 then you should have cleared 11th in 2014, both in regular mode as per the CBSE-NEET guidelines.