Advice for breaking into quant finance after Class 12 (CBSE) [closed]

I have completed finishing Class 12 (CBSE) and plan to pursue a career in quant finance. I have about 2.5–3.5 months before starting undergrad. I wanted to ask: What should I focus on during this time to build a strong foundation? Which skills (math, programming, stats, etc.) should I prioritize? Any specific resources, projects, or habits that would give me an edge early on? Thanks!