Hi Vikram,

Since you have not mentioned branch I will answer in general.
You can refer to previous year gate solved paper books to know about the topics and syllabus and type of questions asked.
(Madeeasy publications or Ace academy publications)
Books have least errors.

Also for studying you can use standard reference books generally suggested by college faculty.

All syllabus of cour branch rileted  book

Graduate Aptitude Test in Engineering

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