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Keep the following in mind (non-exhaustive):
1) About you - your personal life, background and interests.
2) About the Firm - its history, why that firm, why that specific team, about their recent big transactions, how you can add value to the firm
3) About the preferred location - why that city, etc.
4) Basic HR questions (very important) - your 5 year plan, LLM plans, strengths, weakness, overall personality, etc. [This is basically never ending, I can go on and on]

Law:
5) Basics of Contract Act
6) Basics of Transfer of Property Act
7) Basics of Companies Act (irrespective of the teams, basics is very important and a must know)
8) Depending on the team that you are interviewing for, apart from the above mentioned basics, you will need the relevant detailed domain knowledge of M&A/Securities Law/Banking & Finance and so on, team wise.
9) Your CV, inside out - no compromises there. Be 100% ready.
10) Basics of CPC also helps.
In general, stay abreast to recent amendments too, SC/HC mainstream landmark judgments in the area of law you are interviewing for. [Amendments + latest judgements]

All the best! I know the list is pretty long and it might get even longer, with more inputs. But, these pointers should suffice for an interview.. The more you read, the better it is!