Mechanical Engineering

Yes, preparation for MS would be better if you have started from 5th semester onwards. So it's high time to prepare.

Yes, many of the colleges allow this. Some of the colleges in the private sector are Lovely Professional University and Oriental College of Technology.

Please mention what type of courses you are looking forward to pursue from Canada. As you have already mentioned that you have completed B.Tech and M.Tech degrees.

Yes, you can. In SASTRA, 70% seats for B.Tech course are filled on the basis of JEE Main score along with prior weightage to the marks in 10+2.
30% seats in B.Tech are filled on the basis of merit drawn on the basis of marks in 10+2 followed by counselling. In the case of admission through JEE Main over 70% seats, 75% weightage will be given to JEE Main score while 25% to the marks in 10+2. In the case of admission, on the basis of 10+2 merit over 30% seats, normalized marks of each board will be considered.
Best of luck.

Well, it depends on the college. Some colleges have a formal policy for this and merit based selection will be done. Best suggestion would be talk to department concerned heads for the shift. Start early. Do not delay.

1. PSG College of Technology
2. Coimbatore Institute of Technology
3. Karunya Institute Of Technology and Science
4. Government College of Technology
5. Sri Ramakrishna Engineering College.

Below are the colleges:
1. Indian Institute of Technology Madras, Chennai.
2. Indian Institute of Technology Bombay, Mumbai.
3. Indian Institute of Technology Kharagpur, Kharagpur (West Bengal)
4. Indian Institute of Technology Delhi, Delhi.
5. Indian Institute of Technology Kanpur, Kanpur (UP).

CUT off marks for recent years are available at Shiksha website or app or data is available at college or university website or JEE Main website, you can check there for better results.

You can visit the link https://www.shiksha.com/engineering/course/m-tech-in-mechanical-engineering-university-of-engineering-and-management-jaipur-271436?city=109&fro=serp&pn=1&tn=6&ct=course<i=271436&ts=88152835 of UEM Jaipur for M.Tech in mechanical engineering and give a good job prospects.