IIT

You can get colleges of your state, maybe even government ones. Try JEE college predictor to get more information and insight about college which you can get on the basis of your rank-
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=connect&utm_medium=CR_JEECP&utm_campaign=4067795.

It depends on the results of JEE Advanced. In order to get admission in IISC, you must score AIR rank under 50 and in IITs. It must be under 5000.

Hello Jerin,
The admission in IITs is based on the scores in JEE Advanced exams for which you can appear only on the completion of class 12th. In class 11th, you may start your preparations for the exams, and so you can have a chance to get IITs. All the best.

Hi Mainak,
For Bachelors in Computer Science and Engineering, there are a lot of other good colleges, where you can take admission. Some of them are:
IIIT Hyderabad
BIT Mesra
DAIICT
LNMIIT
PESIT
Jadavpur University
COMEDK Colleges like RVCE, BMSCE etc. Galgotias University, Thapar University, Amity University etc.

The admission mainly depends on JEE examination. To get into NITs, good score in JEE Mains is required. To get into IITs, good score in JEE Advanced is required.

You might come across certain difficulties in dropping 2 years as with your age you won't be able to apply to some colleges. You should consider you age as a factor first and if you think you can do well by dropping twice you should go ahead with your plan.
good luck.

Your rank should be under 1000 in the JEE Advance exam or your marks should above 270 in JEE Advanced.

So, there is no syllabus as such but questions are mainly covered pertaining to topics like-analytical and reasoning skills, logical aptitude, design aptitude, general knowledge, english grammar and vocab, mathematical, quantitative and problem solving. Also refer to the UCEED and CEED papers from the years before and other sample papers. Resources on the internet are plenty (which should suffice). Also, there are many books for the above mentioned topics and NIFT, NID study material which you can refer to if needed (for there is some amount of overlap in the syllabus).

For admissions this year, a new caste certificate after April 2018 will be deemed valid.