Big trouble

Ive completely wasted 11th, like completely wasted I dont remember a thing I left my coaching 7 months ago and I dont remember anything(not that ive studied) dont ask how I wasted 11th(irresponsibility, some bad home drama, not studying etc) now that 12th is gonna start can I even do something and if yes how? Im ready to change myself in whatever way it is required going through a hard phase literally had become 95 kgs now a bit better due to gym, how can i improve all of this mess?