B.Sc

Keep your self updated. Read newspapers, u need to have good vocabulary, books are available in the market for the preparation for CAT.
For more help, you can join any of the coaching classes which offers CAT preparations.

Hello Aakash, For GATE you need four year's Bachelors course. If your B.Sc. Is of four years then you are eligible.
I am attaching a link that will give you all the required information.
http://www.gate.iitg.ac.in/?page_id=49.

It is very hard to say, but you can refer the following link to get a fair idea
http://www.iimrohtak.ac.in/admission/wat-pi-2015.html.

Actually in TISS, its very difficult to get hostel in the first year. It is only given to differently abled and category students with low family income. So, yes, you can avail hostel at your own choice and there is no compulsion for that. Therefore, you can go for day scholars option.

Hi Shreyanshee, There is no MCA course offered at BITS Pilani. You can try for other colleges like BIT Mesra, JNU, NIT-Trichy, NIT-Warangal, Amity University, DU etc.
All the best.

You go ahead for B.Sc. And take a coaching class that will boost your competition level.

There are lot more good colleges who are focused more on designing over developing. Like MIT pine, Shristi etc.

Sorry, it's not possible in ITM.