UK

It will be difficult to get job in US and UK without experience as these countries may not give you work visas. You are advised to join Mid or large size IT company. Based on your experience and work you may get onsite assignment with in 2 to 3 years. Once you have onsite experience you can work out a plan for long term stay in these countries.

Hi
At present, China is the best one due to approval of many colleges from MCI and also the cost is manageable. For more information, you may visit the following site.
http://www.mciindia.org/MediaRoom/ListofChinaColleges.aspx

Please visit the following link :
http://www.thecompleteuniversityguide.co.uk/league-tables/rankings?s=computer Science

First, you think of your academic qualifications and get ready for an admission. If you have academic merit, you are respected all over the world. Don't think of any problems in the UK. You can very easily solve them through your merit.

Dear Gurjot, study or teaching hours will differ from UG to PG courses. Every program has different timetables defined by credit points. Undergraduate programs may require 10–20 hours or less of scheduled activities each week depending on the area of study. Master degree study hours differ with taught and research degrees and is based on credit points, an average week will involve about 35–36 hours of work roughly. To understand more you need be here in the classroom and know about the program curriculum. In UK, international students can work for 20 hours a week, part time.
Best Wishes

Hello, can you be more specific? What is your definition of study pattern? I will suggest you read about the education system in the three countries first and foremost, here are some links
https://www.studyinaustralia.gov.au/global/australian-education/education-system
http://www.internationalstudent.com/study_uk/education_system/
http://www.education-newzealand.org/educational-system/
You may individually contact the officers and enquire as in-depth details can be provided by authorized officers only.

6.5 or 7 required

Dear Gurjot,
Always select the university after going through the requirements and then cross checking your profile. The top universities for computer engineering in UK includes but not limited to Imperial College, St Andrews, Warwick, Durham, University College London,Leeds etc.