Hi kirti
Hope you are doing good.
After completion of B.Com, you can prepare for law entrance exams such as - CLAT, AILET, LSAT and SET.
After you clear the exams, you could pursue the LLB course. It is a 3 year duration course. And thereafter, you need to appear for government judicial exams for the post of judge.
I hope, it was helpful.
All the best dear !!!
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