I'm a jee aspirant for 2026. I am geeting 160/300 in mains and 100/360 in advance mock test

I am in very serious confusion and i just want it to be answered. My 11th was decent as i covered full syllabuss except conic section,pnc,binomial and 2 chapters of physical chemistry. 12th is also going very nice but i always doubt that if i will get into iit. My aim is to get AIR<3500. I will complete my backlogs in march holiday but i need proper explanation of how it can be done or it is not possible. (I am studying in unacademy kota offline centre).