Does Calcutta University accept NIOS 10+2 marksheet for BA LLB without getting "Equivalent certificate"?

Because you have passed 12th from NIOS in year 2024. So your three consecutive years for appearing in JEE Mains are 2024, 2025 & 2026. So can't appear in year 2027 as per the eligibility criteria.

Yes, students with qualifications from recognized open or national boards like the National Institute of Open Schooling (NIOS) are eligible for admission to engineering colleges like Darbhanga College of Engineering (DCE), provided they clear the mandatory entrance exam (such as JEE Main) and meet b

To get exam notifications for  IGNOU, SOL and NIOS, you must check the announcement section of the official website and notifications.

Technically not but there is a way out if you take a drop year and do 12th class again with Science stream, study hard and crack JEE MAINS then definitely you can get admission in BTech 

Yes, you may be eligible for B.Tech Biotechnology, but it depends on the admission policy of the university.

Here's how your profile looks:

Biology through NIOS: ✅ Accepted by many universities, provided they recognize NIOS and allow Biology as the qualifying subject. 

Class 12 marks: 72% ✅ Meets