HOW TO CRACK THE HARD NUT (PCS JUDICIAL)

I'm a 2nd semester student of G.N.D university. I secured 3rd position in the university in 1 semester.

My prime aim of life is to become a JUDICIAL MAGISTRATE. but i'm really raw for this field. Please guide me the best way.

a. when to start my practice as trainee in court?
b. From where i can get study material
c. Is there necessity of coaching?
d. Any other relevant information for me; being a fresher of this field.