Hello,
Ther are tonnes of resources to learn for engineering students in the internet.
The best resource I can suggest is YouTube. There are so many YouTube channels such as Gate Academy, Geeksfor Geeks, Gate classes and many more.  Just search inYouTube.
Also, there are websites for courses like ML, Data Science, programming, mechanical design some of them are

• Udacity
• Udemy
• Coursera
• Skillshare
• Edureka

There are many online GATE coaching classes such as

• IES GATE academy
• Made EASY
• GATE forum
• Ace engineering academy
• Engineer's academy

For more details about GATE online coaching please visit this link https://www.google.com/amp/s/engineering.careers360.com/articles/gate-online-coaching/amp

Hope it helps

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