Hi,

Yes, you can become a astronaut without giving JEE. You can persue some degree related to space field like btech or be in aerospace or aeronautics etc. But let me inform you that there is no particular exam conducted by ISRO to become a astronaut. In today's time ISRO chooses his astronaut from INDIAN AIR FORCE ( flying branch ). Recently ISRO is working on gaganyaan mission for which ISRO is selecting INDIAN AIR FORCE's pilots to train them as astronaut. Even INDIA 's first astronaut Rakesh Sharma was  also serving in IAF when he was selected as an astronaut. So, maybe you should try for IAF as it is the only way to become a astronaut in ISRO in recent time.

Hello,

An Astronaut is a person who do research in space. They have to stay in space and their role is to pilot and command the spacecraft and also act as crew members of space members.

Now to become astronaut at Isro one must clear jee main entrance exam and should take admission in IITs and NiTs as isro direct recruiting students from their

You can also apply there without JEE Or IITs college for that you should have bachelors degree with mandatory subjects physics, mathematics, chemistry , science. And masters and phd degree add more value. Have to be physically fit.

All the best!!