To prepare effectively for Class 11 Chemistry Chapter 1:

1. Focus on understanding the mole concept, laws of chemical combination, and the concept of atomic and molecular mass.
2. Solve problems related to the mole concept, stoichiometry, and empirical and molecular formulas.
3. Write down and learn key formulas like n=mM (mole calculation), and the Ideal Gas Law PV=nRT.
4. Practice additional problems from the NCERT Exemplar book.
5. Make short notes and review them frequently, focusing on key formulas and concepts.
6. Practice the previous year’s question papers for better exam preparation.