CSC:Dear Rahul,the Judiciary paper is whole different than the Civil Services Examination. Though it might have certain things in common such as – Syllabus in Polity and Aptitude test. But others things varies the most. The Civil Services Examination consists of Prelims, Mains and Interview.
The Syllabus consists of General Studies- Economics, International Relations, Geography,History, Art and Culture, Science, etc.

This exam will require your whole concentration and focus to clear. It cannot be treated in silos. And thus, have to be prepared in whole. Kindly look at the common aspects between these papers and you will realise how different it is from the Judiciary paper.

Although, if you are well conversed in Judiciary Examination and have already prepared for it, you could take Law as your optional and then start preparing for the CSE. All the Best!