Hello applicant,

*Yes you can only join ISRO after completing your B. TECH that too with atleast 65% marks and from any recognized university . And Candidates must have qualified B.E/B. Tech or equivalent qualifying degree in first class with an aggregate minimum of 65% marks or CGPA of 6.84 on a scale of 10. ISRO is strict about the CGPA or marks and doesn't consider anything less than the given criteria.

*So I will provide you more detailed information about it .

*The Minimum education qualification required is: -

1) You should have a 4 years bachelor engineering degree/Master degree in specified engineering stream.

2) Your degree should be approved from the AICTE.

3) Your degree should be from a regular institution.

Minimum marks requirement -

1) Your minimum marks should be 65% through all the semesters in Engineering

Age requirement -

1) Your minimum age should be 18 years.

2) Your age should not be above 42 years.

*So to know more information you can refer to the below link provided :-

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

Hope it helpful