NDA

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

It is good to hear that you want to join NDA. Unfortunately Government of India has not opened this for females yet.

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 :)

You can join Indian Navy as an officer even without appearing for NDA based on 12th board results. Please refer to following link for details. http://nausena-bharti.nic.in/officer1.php

It is easy, you have to fill the form that is available on the website of UPSC.

HI,
In class 12th you need to score atleast 55 % because it's the minimum. A good score in 12th will also help you to get into other fields.
All the best. Feel free to revert.