B.Tech

Dear Dhruvil,
You need to consider your most interested field and your capability for studying in good college, because just engineering is not enough, you need to do it from a good college.

C, python, jsp, asp, php, Java, & lots more. Moreover, it depends on you whether how much you can grasp. If you can, then almost all are ready to teach the non-curriculum languages in the free time.

There is nothing called best for institutions. All depends on your comfort zone, your attitude to study & study environment of institution. I'll better suggest you to check the site for facilities, its official placement records & stats & then finally think on the issue. As personally I'll say that

BA is not a job oriented graduation degree. If you do not want to do B.Tech then BBA can be a good option for you. It not only will help you to get a job in the banking sector but also in private sector in other types of industries.

Admission in IIMs /FMS / IIT depends a lot on the score you achieve at CAT. The institutes mentioned by you are among the top ranked ones and to seek admission in any of them, you should air for scoring at least 98+ percentile score at CAT and also, do well at the Personal Interview for seeking admi

Refer the below mentioned link:
https://www.resonance.ac.in/reso/news/JEE-Main-Branch-Predictor.aspx

Yes, you can go for B.Tech if you are in science stream
and get good score in 12th and entrance exam so that you get admission in good colleges.