Imo AC prep can be sorted into two chunks:
1) things that are labour intensive to the specific AC - understanding the specifics of this firm’s AC, doing mock tests or interviews, researching about the firm
2) things developed best over time - these are things like commercial awareness/trying to integrate a client mindset into thinking about issues, or getting good at answering motivation or competency questions.
For 1, I’d suggest treating them like a uni assignment and splitting it into chunks e.g. Spending 2 days understanding the firm, with time spent researching practice areas in depth or compiling info on 2-3 of the company’s deals you can talk about in depth. These vary from firm to firm but you’d want to be able to answer questions like ”What sets us apart from our competitions” reasonably well, or apply case studies example to the specific firm you’re working for. These tasks aren’t likely to crowd out all of your assignments, and even if there’s a trade off prioritising the ACs for 2-3 days doesn’t sound too bad
For 2, these are things that perhaps benefit the most from a bit of time every day within the TC process as every bit of work on them makes you a stronger candidate, if not for this AC then the next one/the next application phase. Spending 5 mins a day trying to answer 3- 4 competency questions, recording your answers and listening back before bed with notes for improvement or writing short justifications for how a news story could be relevant to a client/how it could create opportunities for different departments of a law firm has massive compounding benefits over time. This benefits a lot from being a habit thing, and seems unlikely to trade off against uni productivity in a massive way.
Hope this helps!