UK

It depends on what you want to study. Besides the English tests like TOEFL or IELTS, you must prepare for GMAT or GRE if the program is MBA or Masters and entirely depends on university requirements.

No, MCA degree is not available abroad. Similar programs by the name of MS or M.Sc is found. You must check the details on any university's website.

In other counties you need a license to practice as a psychologist. As of now, only RCI gives a license in India. Other than that, there are many institutions that do not ask for a license.

Dear Gurpreet,
I doubt whether universities in the UK will give you a direct offer letter with and IELTS of 5.5. You might have to take pre-sessional English as well along with the MBA program. Also, pre sessional English would only be offered by the university if you have given UKVI IELTS. If the university has given you an unconditional offer then there should not be a problem in securing visa as far as meeting your English requirements are concerned.
I hope this helps.

There are many colleges but top most colleges in USA are MIT, Yale University, Stanford and Harvard university & for UK, Oxford University, Liverpool University and Birmingham University.

Yes, you will be applying for Tier 4 Visa for MBA program, once you receive CAS number from the university.

Any educational degree from UK is accepted all over the world. You need to be sure of what you are going to do with it. Since you haven't mentioned your educational background, not much can be suggested.

Three years degree is accepted in UK and MS management. You do not require work experience. You need good grades, a GRE or GMAT and a good IELTS score.
All the best.

Hi Vismay,
To study medicine/MBBS in UK, you must clear the UKCAT (UK Clinical Aptitude Test) and have secured at least 75%. 60% is hardly accepted. Admissions are competitive and very strict for medical studies, so you must check directly with the universities. You can check the University of Buckingham and St. George's, University of London. You can keep alternate options open such as Philippines or Russia, UK as it is will be extremely competitive basis your grades.
Good luck.

Shashwat, by the time you complete 12th, economy will change and so will the demand of professionals. Hence, it is best if you keep yourself updated with business news and check the SOL of the countries you mentioned. SOL stands for Skilled Occupation List. Secondly, I will advice you to study as per your interest, a course having demand may not be suitable for you. So rather chasing a course in demand which will change after a few years develop your interests and skills. This will also help you in getting a good job and a PR.