Hey as per my idea Yes it is allowed as all non-programmable calculators are allowed in GATE

GATE
The Graduate Aptitude Test in Engineering (GATE) is an all-India examination that primarily tests the comprehensive understanding of various undergraduate subjects in engineering and science. GATE is conducted jointly by the Indian Institute of Science and seven Indian Institutes of Technology

Eligibility
Bachelor’s degree holders in Engineering/ Technology (4 years after 10+2 or 3 years after B.Sc/ Diploma in Engineering/Technology) and those who are in the final year of such programs.

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