GATE

Hello Pranaya,
Taking coaching for GATE is upto you but it is better to have a guidance. You can also clear it by self preparation itself provided you study in the write way.
You need to revise your concepts in engineering and solve as many problems as you can to gain practice and also to associate yourself with GATE pattern.
You may also solve the previous year questions of GATE exam to have an idea.

Made Easy material is best for preparing GATE exam. If you are looking for subject-specific books than refer these-
Electrical Power Systems, Author's Name: C. L. Wadhwa
Power System Engineering, Author's Name: I Nagrath, D Kothari
Electrical Machinery, Author's Name: P. S. Bimbhra
Control Systems Engineering, Author's Name: I.J.Nagrath, M. Gopal
Integrated Electronics: Analog And Digital Circuits And Systems, Author's Name: Christos C. Halkias, Chetan D. Parikh Jacob Millman
Digital Logic and Computer Design, Author's Name: M Morris Mano
Power Electronics, Author's Name: P.S.Bimbhra

GATE and IES these two exam are famous among engineering students. Syllabus of both exam almost same because GATE cover those subjects which are useful in higher studies while IES cover all syllabus of engineering.

To get higher rank, you have to devote more time and study hard with a direction in mind. Make a time table focus more on your weak areas and you will definitely be able to achieve it.

Hi,
The best books for TOEFL:
The Official Guide to the TOEFL Test by ETS Official TOEFL iBT Tests Volume 1 and Volume 2
Barrons Essential Words for the TOEFL
For GRE, The Official GRE Super Power Pack from ETS is mandatory. Also follow books by
Manhattan and Kaplan.
For GATE books basis subjects.