If I (dropper) study seriously from today onwards (6th August), Can I get a good percentile in Mains in January? (Hopium needed)

Class 11 is shit. 12 is okayish. Itne din padha tha pr seriously nahi. Consider ki mujhe sirf basics hi aate hai. Padhai start kar diya hai pr thodi hopium chahiye for muthivation. Maths I will do the high weightage chapters only. Pls give some hopium 🙏