NDA

NDA entrance exam is a key to enter Indian Army at recognised posts.If you are interested in engineering you may also try Indian Navy, Indian Airforce.entrance exam for Marine and Aeronautical engineering. Indian Army also recruits from top enginnering colleges like IITs or NITs.but better you give NDA

No, you are not eligible to appear for NDA-September 2016 as you will turn 19 in August before the exam. Age eligibility criteria for NDA IS 16 1/2 to 19.

16 and 1/2 to 19 years is the age eligibility for NDA.

NDA examination can be cracked by students with average acedmic performance with ease. UPSC conducts NDA examination twice a year. You may appear in next exam. If your prepare well you will able to crack it. All the Best!

Only revision Mining Synonyms, Mining Antonyms and NCERT books for math, vector, matrix, determinants and calculus

You can not do CSE if you join Indian Naval Academy or NDA. You will be trained in B.Tech Mechanical , ECE etc if you join NDA and opt for technical branches.

A book from Arihant publication.
Is well enough or you can go with your
Class 11th and 12th books.

no, you can't. the eligibility criteria is not fulfilled if you have color blindness

Yes ! You can apply for NDA April 2017 as well as you can also apply for this year NDA which may be held in September 2016.
For NDA you should have Physics & Maths in your class 12th.
Appearing in 12th class or Completed your 12th class NDA allows to both students to apply.
You can apply for NDA through UPSC websites.
According to me you should apply this year exam too.
Best of Luck :)