Exam

Yes, this college provides admission through JEE mains score but for you with 101491 rank you might not get CSE in this college.
You can try for other branches like IT, electronics, electrical, civil, mechanical etc.

Well GLIM takes students based on their profile. You have an average profile and also the job experience matters I.e in which domain you had an experience. And also, it takes the cream layer since it doesn't have huge strength. Only 95-99%ilers in CMAT that too with an extraordinary profile can make it to GLIM as it also takes students from other entrance exam scores.

With this rank your chances of admission in GNIT Hyderabad are really less. You can refer to the following link to predict your chances of getting GNIT Hyderabad on basis of your eamcet rank. https://www.shiksha.com/b-tech/resources/ap-eamcet-college-predictor.

University ki degree ya education exam base par nai hoti, university k khud ke recognition par hoti hai. Agar pvr hai to pvt aur agar government hai to government hi rahegi.

The exam centres are disclosed by the university in the application form. you will also be given a choice to choose your centres according to your preference.

Well the date of results will be displayed by the university. It is not necessary though that results will be out early, you will know your marks but rank preparation takes time. All the admissions will be completed by july end.

Look NEET is not at all necessary for pursuing B.Sc. Agriculture. CET is the entrance test through which you can get admission for B.Sc. Agriculture.

According to my knowledge, there is no entrance exam conducted, but marks of class 12 are taken as judging criterion for admission and for more details, go through the official site of this university.