Hello

I am not sure which exam you are talking about (CLAT or AILET  or SLAT or MHCET etc) soI cannot comment on whether you will get admission based on your 83 rank. Now as far as the subjects to be taken for judiciary exams are concerned :

 Judicial Services Examination or the PCS (J)-Provincial Civil Service-Judicial Examination which they are commonly referred to, are entry-level exams for law graduates to become members of the subordinate judiciary. The state governments under the supervision of the respective high ourts appoint members of the lower judiciary based on the competitive examination.

 Judicial Service Examination is held in three successive stages namely Preliminary Examination, Mains and Viva-Voce/Interview. 

The syllabus varies across states. It is broadly divided into Civil law, Criminal Law and Language paper. The weight given to the language paper is around 20 percent to 35 percent. The mains examination constitutes six to seven papers and almost 70 percent of the questions are of law.

For India: You must have a law degree to start with. Any subject group in 11/12 should be all right, then join the 5 year LLB course. After that you can appear for the various examinations for the judicial service.