Follow the given steps:

1) Read the relevant topic/chapter from NCERT - make short notes (this will help in Boards as well)

2) Practice previous year questions/sample questions from Arihant. Similar questions will come in exam. Make sure you clear your concept & reasoning rather than cramming answers.

All the best!

As organic chemistry is the study of the formation, synthesis, and properties of compounds,  S- Block Element, P- Block Elements, d- and f- Block Elements (Transition Elements), Co-ordination and Classification of Elements & Periodicity in Properties, General Principles & Processes of Isolation of Metals Compounds, Environmental Chemistry etc.

So it is advisable to take out the topics which are of more weightage and revise them properly untill you are perfect in the same and for that NCERTs would be the best as many questions are asked directly from the same if you go through the previous year trend. Apart from this, I would suggest you to make all your basics very strong, learn periodic table properly, understand the bonding between same and different groups, all formula and equations should be thoroughly prepared. Also, keep revising the thoery part time to time.

Good Luck!!!