HI,each state has its own syllabus for judicial services exam which includes all central acts like I.P.C, Cr.P.C,Evidence, C.P.C.,Constitution etc.as well as some local laws of that state like Land laws, Excise, accommodation and rent etc.

Please be thorough with all the reading material and books on the above mentioned. It would also be a good idea to attempt old papers on this as well which are available off the shelf in various book stores. 

Make a proper study plan and then follow your schedule.

Good Luck.