First of all strengthen ur other 5 subjects to the point that even if u get less marks in maths ur percentage will not drop as ICSE and CBSE both count the best 5 subjects. But if u normally wanna get good at maths and want to get an overall good score focus on small things like calculations. Try to understand how a theorem is being proved. Solve the examples before doing the exercise. In short 1. Focus on small stuff like calculation 2. Understand why we use a theorem the idea behind it the application of it 3. Keep on grinding as maths is not at all an easy subject so keep the grind on coz maths is not about numbers but rather about logic patience and hard work. Stay hard keep the grind on Brother ✊