You usually start looking for TC during second ye third year. And I don’t think you need LLM to qualify as lawyer. What you need is SQE. After that you just hope that, you get a TC in a firm which specialises in commercial or find experience in those firms. Im in same position as you, currently second year of LLB, but ye getting a TC is a main thing ngl. I’ll say doesn’t matter in what firm or what field. As long as you get the chance and experience to step in the industry, then you can work your way around, by the help of experience on your cv (TC).