NPTEL – Learn from the best

National Programme for Technology Enhanced Learning is one of the best online resources for leaning from the best faculty in India. For preparing GATE, there are courses for almost all subjects. Following list courses can be pretty useful for your preparation, apart from the standard textbooks itself. Main advantage is you can fast forward the things you know, while repeatedly listen concepts that are difficult!

Subject	Lectures	Teacher
Data Structures and Algorithms	36	Prof. Naveen Garg
Discrete Structures	40	Prof. Kamala
Computer Networks	40	Prof. Sujoy Ghosh
Computer Architecture	38	Prof. Anshul Kumar
Design and Analysis of Algorithms	34	IIT B Faculty
Software Engineering	39	IIT B Faculty
Database Design	43	Prof. Srinath, Prof. Janakiram
Digital Circuits and Systems	40	Prof. Srinivasan
Mathematics II	24	IIT Roorkee
Numerical Analysis and Computer Programming	38	Sunil Kumar

I loved the way Prof. Naveen Garg teaches DS and Algos. Absolutely amazing way to explain things. There are many other courses not mentioned here that you might want to try too. Best Luck!