Dear Bapan ,

Yes ,off course as per government rules student must have 70-75 percentage attendance is mandatory for all aspirants to allow the semesters exam but if you have any critical issue like health then it will be consider but you have valid documents for that .

But some of college allows if you have 60-65 percentage and they having also own criteria regarding their rules and regulation you can check by college authority for better clarification .

hope it will helpful !

Thanks