I was assaulted by group of goons and was injured heavily, I want to know what should I do?

I am a student living in Kota, on the eve of Ganesh Chaturthi I was out with my friend when some dude with his friend started abusing him, I came to his help and engaged with them, but they backed off saying they would come back with more people, and they did. They came with 6 people but we fought them off because the place was crowded so they fled. And after this, my friend and I went our ways, but I was followed and as soon as I was alone they attacked me from the back with stones and kadas, and they fled after attacking. I was heavily injured, got 6 stitches on my head, and got a broken nose. My parents came running the next day, and we went about to file a police case, but then they reached out to someone we knew and he arranged that they would apologize for what happened and pay our medical bills (which they didn't and ghosted us as soon as we left) if we agreed not to file a police complaint. I thought it was fair at that time because they too seemed to be 17- 18 years old only and it would have left a permanent mark on their status, also because I had to focus as JEE MAINS was approaching. They didn't follow through with the money and got away with it without consequence. I later got to know this wasn't the first time they were doing something like this and they have a group of 50 or so members and take part in such actions regularly, some of them already had previously been called by the police but due to them being 16-17 got away with it without any action. We had registered a complaint with the police when this incident happened (not an FIR) and have a copy of it. The coaching institution was of no help either. My parents don't want to take any action against it because of the exams approaching and also cause I live alone in the city far away from my hometown so it's a matter of safety but I think we should take action at least when the exams are over. What should I do?