MBA Entrance Exam

No chance.I would suggest you to take CET once again.

There are famous training institutes like TIMES coaching institute, IMS and Career Launcher. Therefore, you can check with one of the institutes nearby you.

The applications for MAT, September will start from August onwards and from December exams, November onwards.

Please refer to following link for list of top B-Schools which accepts CMAT score for MBA admission: https://www.shiksha.com/mba/ranking/top-mba-colleges-in-india-accepting-cmat/2-2-0-0-5822.

MAT score is used by 600+ B-Schools to shortlist candidate for their selection process which may include GDPI and other tests. You may refer to all India ranking of top B-Schools which use MAT score as the selection criteria: https://www.shiksha.com/mba/ranking/top-mba-colleges-in-india-accepting-ma

You can go for TIME, IMS or CL.

Yes, if you have basic knowledge of quant; GK and by solving previous year's questions, you can easily do that.
All the best.

Dear,
Almost all the MBA colleges go for CAT MAT or CET examinations. There are some colleges provide admission on certain criteria as management quota, which cost more. You can prefer Jaipuria Institute for the same. All the best.

Kindly mention the city of your preference for a better answer.

Dear Gauri Jadon, read regularly English newspapers, secondly work on comprehension passages in English. For that, follow WREN and Martin books that will be helpful, further, BARRON book for GMAT will be helpful in all the respect. All the best.