The course for GATE exam is very limited and it has been continuing for above 25 years so it is highly probable that you come upon a questions similar to previous year question but 90% No.
Few questions comes with modification like earlier if they ask for formula this time they may ask numerical on it.
Sometimes value in the numerical can be changed or sometimes different entity can be asked. Lots of Free stuff available on net.
My suggestion is stick to basic and clear each and every concept of your domain.Once its done
go for previous year question papers.
Get course material from Ace or Times Academy.(they are deeply involved in it and have recognised classes in India across all major cities)