Go for the correspondence course given by FIIJEE or Brilliant Tutorials.
Which are the institutes offers 1 year correspondance course ?
Yes
Bansal Classes.
Yes, the Course of Computer Science is available in IIT but you do not need to study it to qualify in IITJEE.
The Portions of IITJEE are generally based on CBSE Class 11 and Class 12 Syllabus but you must join some good coaching Institute like FIITJEE, Bansal Classes, Brilliant Tutorials, Aakash IITJEE etc.. to boost your chances of getting into IIT.
catjee
get it from www.schools9.com
You can get the IITJEE Key from the FIITJEE Website.
IITJEE is tougher than CA.
It has always conducted IITJEE.
IITJEE helps you get into the best collage in India and you have a lot of Opportunities after that.
IIT offers various Course in Engg. and Science. It depends on your rank in IITJEE and also your own Interest.