hello subha......

the important lessons in the neet exam chemistry to score 100+ marks are

equilibrium

redox reations

chemical bonding and molecular structure

organic chemistry

chemical compounds

p block elements

atomic structure

alcohols,phenols and ethers

aldehydes,ketones and carboxylic acids

i hope this information is helpful

all the best.

Hello Shubha

To get 100 in chemistry is an easy task. To get 100+ marks you just have to do few things:

Clear your concept especially in the chapters like atoms, surface chemistry, electrochemistry. Basically the chapters having numericals because it helps in quick understanding of the questions.

Understand all organic chemistry’s reactions as there's a great weightage of its question and its easy to score in those questions.

Try to learn the formulas like nernst equation, equation of solids etc.

Topics of equilibrium and thermodynamics can help you decide you ranking.

S,p,d and f blocks reactions are also important.