Gateoverflow is not only the best online resource for previous year gate questions but also best resource for other related computer science exams like TIFR and many others. It is a forum where all your doubts get resolved, queries get answered by experts with lucid explaination. Gateoverflow has been important part of my gate preparation. It has been over an year I am user of Gateoverflow and I have learnt lot from here and still learning. I would suggest you to use Gateoverflow book of previous year questions ,this will ensure that you dont miss any previous year question.
I would say Gatecse is best available online resource for all computer science gate aspirants. Here you will get all information regarding gate i.e from preparation strategy to cutoffs and admission.Gateoverflow has listed best books and videos for all subjects do refer them.
Discussions on google docs and moodle were worth. It was like quick revision of all subjects. The best thing was discussion were carried accoring to schedule and all important and tough previous year questions were discussed.
I would like to thank Arjun Sir for his guidance and motivation.I would also like to thank Arjun Sir, Praveen Sir, Pragy Agarwal and entire Gateoverflow community for providing awesome and clear explainations over questions.
I would suggest all future gate aspirants to make best use of this platform. Wishing all future aspirants good luck.