Heyyy Isha....

Yes, you can definitely. Practising GATE sample papers make you completely aware of the syllabus, nature and type of questions that are expected to come in the test paper. Solving the previous years’ question papers will help you to get a grip over various elements of the question paper. Also follow the tips and strategies as in the below link : 

https://engineering.careers360.com/articles/how-prepare-for-gate-without-coaching