IIT

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1) Beware of using too many reference books.
2) It can help you to score more by indexing topics in order of priority or weightage they carry in JEE Mains and Class XII board exams.
3) Revise, practice using previous year papers of IIT JEE.
4) Time management is an important factor in JEE Mains. So, while solving model JEE question papers, keep an eye on your watch too. If solving a question is taking too much time, move on.
Kindly go through the link mentioned below to know more details:
http://www.askiitians.com/iit-jee/how-to-prepare-for-iit-jee.html

An expert panel "Committee of Eminent Persons", constituted by the IIT council and headed by Ashok Mishra, the committee has suggested that JEE Mains and JEE Advanced be combined into a single engineering entrance exam. But there is no final decision announced on this subject by MHRD yet.

IITs does not offer degree courses on BCA or B.Sc in CS. You are advised to appear for JEE to do B.Tech CS in any of the IIT. You may refer to academic programs offered by IIT Indore: http://academic.iiti.ac.in/academicprogram.php

Yes, they are very helpful because a school level book is not enough as you need to get to understand every aspect to the core and you need to learn the shortcuts to save time the exam. For all these purposes, you should refer to IIT foundation books.
All the best.

As you know Airbus and Boeing are very big companies and they only select candidates with high expertise level. First of all, you have to be a topper in every field. You can opt for aeronautical engineering from IIT or some other good institute and after that pursue Masters in aviation. With good grades you can apply for these companies and after cracking the interview, you can get a job in these global giants.

Allen, Kota is the best option.

If you get admission in an IIT, opt for electrical engineering. For CSE, you can opt for both IIts and NITs. IITs are known for electrical engineering, they have good placement percentage for electrical engineering too.

There are no changes at all except that from next year onward, JEE AIR will be calculated on the basis of JEE marks only. there will not be any role of class 12th boards marks. Earlier, 40% of the weightage was given to boards marks and 60% to JEE marks. Therefore, you must focus on JEE more than boards. 60% marks in boards are enough.

Old NITs are the best. Some of the top level NITs are MNIT, Allahabad & NIT, Warangal. IISC, Bangalore is also famous as it has good placement. IIT Roorkee is famous for its civil branch. IIT Kanpur and Bombay are at the top level. New IITs are not good in terms of placements and facilities.