Please help

I am currently studying in 12 th standard (Jee) it is just about to end. I really want to play some games. I am not sure what to buy a gaming laptop ( but don't know which branch I would select) so I have no idea about the specs required. I also wanted to have a pc of my own.

I saved up my money through the pocket money I got around ~43k and was considering to use my old as laptop as a monitor(not dedicated gpu) and buy a pc or should I add to the budget my father alloys and buy a gaming laptop ( I have heard their life spans are short)

Pls give me some advice