Hello aspirant,

I hope that you are doing absolutely great.

With reference to your above mentioned query, i would like to tell you that you can choose any one or two of the following listed subjects in GATE . A candidate is expected to choose papers that are relevant to his / her qualifying Degree. Ultimately, candidates are free to choose any one or two of the 29 papers as per the combination provided by GATE office.

Furthermore,  For candidates who choose TWO papers, the combination must be from the approved list of combinations and subject to the availability of infrastructure and date .

Further, to know more about GATE Exam, follow the below mentioned link to know more : https://engineering.careers360.com/exams/gate

I hope that this will help.