Cambridge

Such colleges do not write any percentage. You should aim at scoring 95 above, but even if you score 92, with exceptional qualities you may be the best fit. Sat score should be really high with high subject test scores. Apart from these, your recommendation should be strong and your extra curricular should be different from others

In india, A levels are recognised by many universities but not all but slowly the trend is changing. The major issue is that most of the admissions for undergrad are closed by august and it becomes difficult for IGCSE students to apply. The subject combinations also becomes a challenge sometime as the streams are fixed in india unlike abroad.

Hi Leena, can you mention which level of study you are referring to ? In any case you may check the program specific admission requirements on the websites. However feel free to revert.

Dear Leena,
Eligibility differs on what you want to study, whether you want to study bachelor or masters. Irrespective of program you must have excellent academic grades and must demonstrate high intellectual capacity. You may share what you want to pursue or rather visit the websites for details.
Best Wishes

Hi
Mba at Cambridge is very competitive one and there are different specialization like executive mba, finance etc. The link I am sharing has all the info on how to apply and what all is required.
http://www.jbs.cam.ac.uk/programmes/master-of-finance-mfin/how-to-apply/our-requirements/
In case you need further guidance, post here.

PG in which branch/course?

Dear Ritu, you will find online application both the university websites. They also have the application checklist and documents you need to upload. Eligibility criteria varies again according to the program you want to study. Nevertheless you must excel in your academics as these are two of the world's top universities. I will suggest you first visit the websites.
Best Wishes