IIf you are talking about NEET 

organic chemistry>inorganic chemistry 

maximum questions come from organic chemistry say 15 -20 questions & from inorganic chemistry 10-15 .

Important chapters are: 

Carbonyl compounds, Alcohols,Phenols & Ethers, Isomerism & IUPAC & then the rest

Important chapters inorganic chemistry: 

chemical bonding , d & f block elements, co-ordination compounds 

Dear Student,

Please mention the name of the entrance exam?