Hello Romi,
After you have completed graduation in the Physics subject successfully, you can do the mechanical or automotive engineering depending upon your choice. Rather it would be very much easier to you since these branches require a good physics background. But, note that you have to start the course by raking an undergraduate degree and then the post graduation(optional). You directly cannot opt for masters in the engineering course without a BTech/BE degree.
Good luck and stay safe!
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