Maths It's not intimidating or hard. Many people dread discussing it. It's the only subject you'll use after school
We do math by hand. You can't just 'learn' chapters—you must understand concepts and practise. Start practising straight away.
Start with simple issues. If you just understood the chapter, hard math will discourage you.
Math questions are common. Don't allow doubts fester, have them cleared up right away.
Some people stick diagrams or formulas on their study table or walls. Make flash cards of all your textbook's formulas and adorn your room with them.
Derivation may not be exam-relevant, but it's crucial for understanding. You need to grasp the rationale behind a formula to memorise it.
Math is all about basics. Even if you're studying for JEE, you need a solid foundation from 9-12.