Oxford

Hello,
Before answering to your question, please do research about the above mentioned colleges. After that join in a college where you will be learning actual practical exposure which will be beneficial to you.

Well it will depend on the university if they will offer you an admission or not, you can apply, your grades are good. Take your IELTS, a score of 6.5 and higher is recommended. Check UCAS website, you are supposed to apply to Oxford through UCAS website by 15th October, this is the deadline for any course in Oxford and Cambridge. Check here
https://www.ucas.com/ucas/undergraduate/getting-started/ucas-undergraduate-when-apply
Go through the UCAS website carefully before applying.

Hi Swati,
Be a little more specific with your education background and what you want to study.

For which course are you seeking admission?

Hi Aditya,
Oxford and Cambridge are more into intellect so you have demonstrated the same. Study very hard and achieve excellent grades. Also they want students who can contribute to the university and the society so be an all-rounder. Know your talents and pitch in your areas of excellence. From sports to culinary skills whatever may be your talent besides academics, simply demonstrate. Remember to maintain high academic grades throughout.

Since Oxford is VTU approved and REVA is autonomous.
It depends on you which you opt for.

Hi Divya,
You must hold a Bachelor's degree with very good grades and must have at least 2 years of work experience and must submit GMAT or GRE scores. The application process is online, you must submit the online application form before the recommended deadlines along with your academic transcripts, MBA essays, test scores and recommendation letters. Read more here:
http://www.sbs.ox.ac.uk/programmes/degrees/mba/how-apply-mba/mba-application-requirements