GRE

https://studyabroad.shiksha.com/exams/gre
Use this link to know about GRE.

Pass score depends on the college you apply for. Generally, 310+ out of 340 is considered a good score in GRE. In TOEFL, 80+ out of 120 is the minimum eligibility criteria of English proficiency. In GRE. The verbal section is very hard, so you need to prepare well for that. TOEFL is easy, just a month preparation is enough to score well.

To do Masters in Canada, IELTS is must but some colleges can accept TOEFL too. In Australia, IELTS is mostly accepted in colleges. So, I personally suggest you give IELTS exam. Also, GRE is not mandatory, but it will enhance your application and you might stand out from other students, so there's more chance to get the admission.

https://studyabroad.shiksha.com/exams/gre
you will get each and everything here.

In simple words, eligibility means to fit on it, or to be desirable and it means you can choose any one of them it's not compulsory to choose all of them you can choose any one of them.

Your academics are very low so you cannot get a good university in USA.

There is not any particular score but students with 300 have got calls, it varies a lot. You can also get a call from IIM Bangalore, and they and Indore have separate exams too.

Firstly, you need to know what you want to do. If you want to do MBA, then you need job experience. If you want to do MS or Master's degree, then you need to contact the colleges or universities you are targeting and then you will get the required criteria.
Good luck.