Australia

yes u can.just go ahead

u can do MBBS or bds or u can also do bpt it has much value in australia

Check the latest list here and decide what course you would like to go for.
http://www.sbs.com.au/yourlanguage/hindi/en/article/2016/05/17/want-migrate-australia-2016-17-skilled-occupations-list-sol-announced

The average cost per year of study in Australia for international students is AU$42,093 (~US$32,950). This breaks down to AU$24,081 (US$18,850) for fees and AU$18,012(US$14,100) for living.

It depends on the skill shortage list which they release every year. Check here and decide.
http://www.employment.gov.au/national-state-and-territory-skill-shortage-information

For what course are you looking for and with what budget?

One year gap is fine as long as you can explain the reason behind it.

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.