Diploma

No Doubt b.tech! after that m.tech or MBA. Degree has weightage which diploma doesn't. still it's upto you completely.your field of interest :)

Search for frankfinn institute on google nd if you want to do travel nd tourism then do it with frankfinn as it is no. 1 in training for aviation, Travel, hospitality and management

in NewZealand and Canada you are allowed to work 20 hours per week. In NewZealand after Level 7 program you will be given one year work search visa. once you get a job you will get two year work permit. once you get work permit you are eligible to apply for PR.

Don't lose heart. Congratulations for passing 12th class exams. You have rightly decided to go for diploma courses. There are various diploma level courses for you to do. You can do diploma in engineering, entrepreneurship, event management, hotel management, fashion designing, interior designing, architecture, computer applications, food and nutrition, tourism, etc.
All the best.

For diploma holder there is different entry (lateral entry). Diploma holder get chance to get admission directly in 2nd year. And there is different admission procedure. There is entrance exam which you have to give and your percentage should be good.