Dear Pinki, Sometimes students drop one or more years for entrance exam preparation. Some of the students join a institute but go for better options next year. When such students take admission in any university or college they are asked for GAP YEAR AFFIDAVIT or GAP YEAR CERTIFICATE.

Gap Year Certificate / Affidavit
The Gap Affidavit to be given on stamp paper duly notarized stating that during the said period the candidate did not join any other course in any statutory University / Institute. In case, candidate had joined any College / University after
HSC / 10+2 Examination then the candidate should submit Migration Certificate of that particular College/University.

Gap Year Certificate Format
Generally you get a basic format in Admission Information Brochure of the college you are taking admission. If so you have to use the given format only.
If there is no prescribed format given by your college you can simply go to the notary and ask for 'Gap year affidavit'. They already have prescribed format. They will ask you some basic details and provide you the same.
All the best
Feel free to ask for any query