Hello Abhimanyu,

If you are in Mechanical branch and preparing for GATE, the most important part is your core subjects. Lay more stress on those. Also practise engineering mathematics questions, as they account for around 20% of the questions. For more preparation regarding gate please refer the below mentioned article:

https://engineering.careers360.com/articles/how-prepare-for-gate-mechanical-engineering

The syllabus link is below:

https://engineering.careers360.com/articles/gate-syllabus-for-mechanical-engineering

For IES, https://engineering.careers360.com/articles/cracking-ies-stable-career-assured-growth-trajectory

Hope this Helps