Class 11 Inorganic Chemistry. You can't do without it. Since it has the two most important chapters - Periodic Table and Chemical Bonding and they form the basis of almost more than half the questions asked. 

Understanding the various blocks (s, p, d and f) is impossible without a good hold over these two chapters. All the concepts are covered in detail but still presented in a crisp manner.

A lot of students who find chapters like p-block difficult, are weak in chemical bonding. These notes will give you a whole new perspective to these chapters, and help in learning the complex orders.

The notes are organized as follows:

1.  Periodic Table
2.  Chemical Bondings
3.  s-Block, Hydrogen and p-Block
4.  Some extra points from NCERT

Pro-Tip: It is advisable to read Periodic Table and Chemical Bonding from my notes. Rest, a reading of NCERT will be enough

Due thanks and credits to Varun Tatran sir (VT sir) who helped make these formulae so easy to remember and apply while solving IIT-JEE level books such as the one by Balaji Publications - NA.