Harish, honestly speaking, it is very difficult to complete any reference book in a month, leave aside organic chemistry as organic chemistry requires a student to understand all the basics related to a reaction or a compound like mechanism, formation of an intermediate, which is the preferred site for attack of any substituent etc which can only be improved through continuous hardwork for quite some time. However, if you are determined and have some idea about the concepts and basics, then some topics from these books may be completed in one month:-

ORGANIC CHEMISTRY by Mehta and Mehta

NCERT Class 12 Chemistry

NCERT Class 11 Chemistry

ORGANIC CHEMISTRY by Morrison and Boyd

ORGANIC CHEMISTRY by FINAR (very tough to complete in a month)

These all were some books which you can complete probably in 1-2 months if you are determined enough and also these books are the backbone of Chemistry section of any competitive examination, so if you can complete them with understanding, then you have a good chance to score good marks.