you can also try
but you need to verify the source and the file authenticity before using it you can also try but you need to
MS Chauhan's book is one the best book for organic chemistry and its advance problem . you can also try but you need to
Here is a downloadable pdf link but you need to search on google : you can also try but you need to
https://drive.google.com/file/d/14xAkf7yQWlR6F6MfH_fJ__zVFPH6pdb/view
https://www.google.com/search?q=advanced+problems+in+organic+chemistry+for+jee+by+ms+chauhan+pdf+solution