Hello,

ISRO, an acronym for Indian Space Research Organization, is one of the world’s leading space agencies, known for its cost-effective ventures and advanced technologies.

So technically a space agency. As mentioned in the website you require a BE/B. Tech or equivalent qualification in first class with an aggregate minimum of 65% marks or CGPA 6.84/10 (average of all semesters for which results are available) to be eligible for ISRO.

You can join using bsc but you have to be first class passed in all the subjects. You can enter ISRO as a scientist or an engineer in one of two ways. You will take the IIST exam (Indian Institute of Space Science and Technology (IIST), Trivandrum) after or during your 12th grade.

After Bsc physics you can join as Technical Assistant, ISRO allow you option of part-time or correspondence study, after completing Msc you can get promoted to Scientist-SC.

https://www.isro.gov.in/sites/default/files/frequently_asked_questions_and_answers_cepo_2019.pdf

https://engineering.careers360.com/articles/isro-recruitment

Hope this helps!!!