Is there anyone here preparing for the PSI exam or other government jobs?

I’d love to hear about the PSI exams. Like from where should I start and do I need to join offline classes Or self learning is enough, anything more I should do, are there online groups who does preparation for exams. After working private jobs for a while, I’ve realized that I should focus on government jobs instead of chasing after the low pay from private companies. I'm 23, currently making 30k at a private job, and I'm also pursuing my undergrad from an open university. Since I fall under the reservation category, I really don’t want to miss out on this opportunity. Plus, I have two years left to finish my degree, so I've got some time to prepare. I know I'm a bit late to the game, but hey, better late than never