USA

Go for M.Phil and UK is better for the same. For Visa and other benefits, Canada is better.

You should apply online. They even offer scholarships for Indian students but not always. You need to complete IELTS test for which you need to spend 10000-12000 INR. Now you can apply for universities like Harvard and Birmingham and all. If you apply now, for June 2018 admission, it's better. All the best.

There are a number of colleges which offer architecture courses in USA. Some of the top colleges/institutes are listed below:
1) Carnegie Mellon University (USA)
2) New York Institute of Technology
3) Harvard University , Cambridge, USA
4) University of California (Berkeley Campus), Berkeley, USA
5) Princeton University, Princeton, USA
6) Illinois Institute of Technology, Chicago, USA

Hi,
Scholarships are commonly awarded on merit basis. The better your profile i.e. high academic grades, extracurricular activities, etc. higher are the chances of obtaining a scholarship. Various resources could also be checked like British Council for UK and Fullbright Nehru Scholarships for USA. You can visit the websites for details.

Hi,
Some of the best universities in USA for computer science are:
MIT
Cal Tech
Georgia Tech
UC Berkeley
Carnegie Mellon
UPenn
UCLA
UT Austin and so on.
Check if they accept three year Bachelor's degree, most of them do not.

Hi,
Top US universities such as Harvard, MIT, etc. do accept 3-year Bachelors degree. However, there is no MCA abroad, this is specifically a degree only awarded by Indian universities. You may check for MS Computer Science, Applied Computing, etc.

Hi Crystal Verma,
In USA it may be waived off depending on the university and your profile. But in UK it is compulsory no matter how good your academic grades might be. You must take IELTS for UKVI to study in UK.

Hi Abu Khan,
Since the scholarships by US universities are awarded on merit-based system, you must submit a very strong application. Scholarships will depend on your test scores, academic grades, letters of reference, personal statements, etc.