If you want to join ISRO then you will have to complete 12th standard(or equivalent) with PCM major and then you will have to give JEE Mains and Jee Advanced both and qualify in these exams and get a good rank which can fetch you a seat in Indian Institute of Space Science & Technology(IIST), Thiruvananthapuram. IIST is an institutite established and controlled by ISRO

To know more about space technology visit link

https://www.google.com/amp/s/www.careers360.com/university/indian-institute-of-space-science-and-technology-thiruvananthapuram/amp

Or

https://www.careers360.com/courses/space-technology-course

Hello,

To become a Space Scientist, you need to have a relevant career in pure Science or any other engineering disciple. Despite being any subject, you can have scope of being a part of ISRO as all roads leads to the career in science. ISRO recruit candidates with PhD in Astronomy, Physics and Mathematics along with engineers in disciplines such as mechanical, electrical, electronics and computer science.

The recruitment to ISRO is conducted by a Centralised Recruitment Board. The The selection will be made through a written examination and an interview. And also by the eligibility criteria and other factors.

Hope This will Help You!!! Best Of Luck!!!