MS chauhan has these three problem books in organic chemistry.
- Elementary problems for JEE
- Advanced problems for JEE
- NEET
There’s no difference between 1st and 3rd as far as difficulty level of problems is concerned.
But still, I would suggest the 1st one. Reason being, it is more revised than the NEET version and it has some problems that are challenging enough to keep your adrenaline high.
I tried solving General Organic Chemistry and Stereochemistry from the Advanced Problems for JEE… I am telling you, they are useless.
It’s better to complete a basic book than a few rare questions of one advanced book.
Note: the JEE version offers a solution manual separately… which might come in handy… I gave NEET in 2016, and they did not have any solution manual for the NEET versi