Diploma

Yes you can. The minimum eligibility requirement is 12th.
In general Candidate Profile for Freshers for cabin crew is as under :
Age:Between 18 and 27 years
Minimum Height:Men - 170 cms and Women - 157 cms
Weight:In proportion to height
Educational Qualification:HSC (10 + 2). Candidates who are appeari

Post Graduate Diploma in Pre-Primary Education (PGDPPED)
Minimum Duration:1 Year
Maximum Duration:4 Years
Course Fee:Rs. 9,600
Minimum Age:No bar
Maximum Age:No bar
Eligibility:
Bachelor's Degree or a higher degree from any recognised university. Rs. 9,600 (programme fee) + Registration fee of Rs.200
Object

Polytechnic is also a Diploma course, if you want to go for technical fields. The eligibility for getting admission in a Polytechnic college, is you must have passed class Xth from a known board. Other than this, you have to fill out the form for Polytechnic exams, which are held for the selection o

No, you can change your branch. You can only apply for relevant branch.

https://www.shiksha.com/engineering/colleges/diploma-mechanical-engineering-colleges-thane
There are only 3 colleges in thane and those are listed in the link above with all the information.
I hope it helps you.

HI Anand, Whatever University you want to join for doing B.Tech you have to check there admission criteria. Now I will tell you the eligibility criteria for B.Tech which you should have:-
B Tech- Eligibility Criteria
1.60% marks or equivalent in Class X in five subjects (Compulsory subjects - English,

According to me, yes, you can totally get admission in RAIT with 75.24% in Diploma.
However, I am not aware of the exact cut-off. For confirmation, check with your friends if there are any in the college or you can contact the college office to be sure.