Okay so the order of importance is: 

organic chemistry>inorganic chemistry>Physical chemistry 

give maximum importance to organic chemistry because organic chemistry class 12th has a predicted % weightage of 28.89% keep writing all new reactions you learn in a seperate notebook & revising thouroughly 

Inorganic chemistry: chemical bonding, co-ordination compounds, d&f block elements are important chapters

physical chemistry: equlibrium, thermodynamics Chemical Kinetics 

The total asked questions in Chemistry are 45. I would suggest you to go through with the given below link to check complete exam pattern.

https://medicine.careers360.com/articles/neet-exam-pattern

Good Luck!

Each division carries approximately 13questions from each division.if you look at 2018 question paper nearly 29 questions are asked from physical and inorganic and nearly 16 from organic.