UK

Dear Sowmya,
To apply to universities in UK you must use the UCAS website. You will find all the relevant information here. Take the IELTS and try to score 6.5 or above. IELTS is a requirement and cannot be waived. No other exams are generally required. On the whole you must have good academic grades particularly in mathematics. Here is the UCAS page https://www.ucas.com/
Best Wishes

Doing GRE or GMAT exam and ger admission in abroad university

As informed on the earlier query you must fulfil admission requirements irrespective of your sister living in London. Not only must you have good grades, you must also meet IELTS score requirements of the universities and must take UKCAT.

Hi Vismay,
Your grades are decent, however you must also take UKCAT ( UK Clinical Aptitude Test) for admissions into a medical school in UK. Additionally you must take IELTS too. The only benefit you will be getting because your sister moved to London is that she will know the process. Your admissions into a college has nothing to do with your sister living in London. You must fulfill the admission requirements most importantly. Please read about UKCAT here
http://www.ukcat.ac.uk/ and visit university websites for admission information.
Good luck.

UK have a different name of courses ACCA, ICAEW, CPA etc. You hv the option of completing CA in India and then applying for membership at UK. Check here.
http://www.icai.org/post.html?post_id=11449

Hi Tapan,
Admission requirements vary but in top colleges you must have excellent academic records. For universities in US you must also take GRE. Additionally you must take TOEFL or IELTS. For admissions you will require LOR, UG transcripts, statement of purpose, application fees. There are also university specific requirements as mentioned, so you must select the universities and check the websites. Few universities might also require work experience. Hope it helps.

You have to clear GRE exam.