i would reccommend you to go fot thapar, patiala. it has great placement records and brand value. go for thapar without a second thought.
pls refer to the following links for comparison:
hope this helps.
It depends on you choise and interest whether you want to go for CSE or mechanical. But I would suggest you to join Thapar mechanical as it has been ranked much higher when compared to ms Ramaiah. But fees in ms Ramaiah for mechanical is lower than Thapar.
Link of comparison between Thapar and ms Ramaiah