UK

However, there are several universities in the United Kingdom that do not require IELTS which means you can study in UK without IELTS. Examples include Sheffield Hallam, University of Warwick, University of Bristol, Swansea University and University of Greenwich.

Hello,
I would suggest you to complete your undergraduate course in india and then apply for the Masters degree in UK universities. You require a good score and clear your english proficiency test of IELTS.

The criteria is mostly excellent scores and grades.

Yes, if you can get admission in oxford or brookes it is really worth to pursue it. It is good for your personal growth and exposure as well as for career opportunities. You will easily get brilliant packages in any company you wish.

It is your choice. There's no point in getting a visa that early. You have to factor in other things like value of pound, political stability and other rule changes etc. Consult with an education consultant and ask for their opinion. P. S - if you haven't completed IELTS complete that first. Even if you pay the amount, you are gonna get a conditional offer letter and not an unconditional offer letter. So it's better to complete your IELTS before paying. But do check whether there's a deadline for fee payment. Enquire directly with the University if you don't trust the agent.

75% is the requirement as far as I am aware.

Among these three, Australia is the cheapest. And the fee structure depends upon the course.

The score depends on the programme. What scores are you looking at?