Hello Deepu,

From this question I am assuming that your asking ; If the NAAC grade is 'A' means the college is good. So NAAC is the National Assessment and Accreditation Council and it is an organisation that assesses and accredits higher education Institutions in India. If a college gets ranks above B++ it is considered that the college is good. If a college has A rank then the college is very good. But for a note, these grades are based on the functioning of a college, its facilities towards students. It is also dependent on the internal working of the college.

You should check out this link for more knowledge:- https://en.m.wikipedia.org/wiki/National_Assessment_and_Accreditation_Council

I hope this helped.

All the best.