Hello,
Well, Yes you can join ISRO but not as scientist you can join as technician or assistant engineer. But only B.Sc maths will not work it out for you to join ISRO you must need to be at least a PhD degree as you can go back to get a BE degree
So complete your Msc or directly go to complete your phd through reputed universities in aerospace research or other branches which will help you get more close to ISRO
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