No it is not. But joining a test series from any good coaching institute is what I recommend. Every test exposes some part of the syllabus you aren't proficient with. So you can work and repair yourself with that part.
What is the individual weightage/ no of questions of different topics in different years of GATE?
Where will the test center be, in my city?
Why should one take GATE exam?
Can I give GATE paper other than my graduation discipline?
When will the GATE result declared?
I don't understand TOC, or subject X. Should I study it?
I'm not sure I can crack GATE. Should I go for it?
I'm a working professional, I don't have time. Can I even dream of GATE?
How to start GATE preparations?
How to perform self study?