How do you get GATE without coaching

You can always prepare for GATE exams without the aid of coaching, but it is always a good idea to practice GATE mock tests, etc (from a site like: http://thegateacademy.com/gate-free-test/ ) to know where you stand and ofcourse practice. One must rememeber that aptitude exams such as GATE always test your ability of being able to apply your knowledge. So practice a lot.