Hi there! My interview preparation approach, which led to a VS offer 4/4 times I implemented it, was essentially split in four phases:
Step 1 - Preparing ideas for answers
The first and most difficult step in preparing for interviews is learning how to respond to a wide variety of questions. Of course, you cannot prepare beforehand for all potential variations of all potential interview questions. Furthermore, you do not want to learn answers by heart and then just repeat them in front of the interviewers - they are likely to sound robotic. However, by investing a substantial amount of time thinking about how you would go about answering to as many different questions as possible, you start learning how to describe your motivations and experiences in a flexible manner. This decreases the chances that you will not be caught off-guard by any given question. It also increases the chances that, even if you have not prepared for a question you are being asked, you will find a somewhat sensible answer to it.
The first thing I would do when invited to an AC/interview (and for a video interview, but not in the same level of detail) would be to try to build a question bank to practice on. I would create a Word doc with a few big headings (like 'CV based/competency questions'; 'motivations/firm-specific questions', 'commercial awareness questions', situational judgement questions' etc) and firstly write down all the questions I could think of under each relevant heading. I would then look at my CV, and find try to think how I could leverage my experience to answer those questions. Finally, I would write 2-3 short bullet points under each questions to explain how I would answer it - I have found this helps with memorizing the ideas for your answers. Thus enabled me to both have the ideas ready to go in my mind for a high number of questions and to be able to go through the though process of formulating the answer in the actual interview. It is also worth mentioning that at this step I would prepare particularly well for the questions I thought were very likely to come up (such as Why the firm, Why me etc).
The second stage involved searching for interview question banks on the internet - such as the one offered by TCLA
here. While reading them, I would spend around 30 seconds on each question thinking of potential ways of answering them. I would then copy the questions I was having particular difficulty with and add them under the relevant heading in my word document. After finalizing this process, I would once again look at my CV and spend a longer amount of time thinking how to best answer each of them. Then, I would note down my ideas in short bullet points.
The final stage was similar to the second, with the only difference being that I would search directly for examples of past questions asked by the firm I was interviewing at - resources that were useful were this TCLA forum and Glassdoor.
Step 2 - Practicing articulating your answers
Once I had found the right ideas as to how to answer most interview questions, the second step of preparation involved improving my ability to articulate them. Despite the initial awkwardness of this method, I have found it incredibly useful to simply turn my laptop's camera on, pick one question at random, give myself a few seconds to think, and then record my answer. Subsequently, I would watch the recording with as critical an attitude as possible to see the parts I was struggling with the most. Then I would repeat this process again and again until I was happy with the way I was answering any given question.
A point worth noting is that as I was deciding at random which question to respond to, I would try to tweak the specific phrasing of the question in my mind. Thus, instead of just learning how to answer 'Why do you want to pursue a career in commercial law?', I would learn to answer many variations of the same type of question, such as 'How did your interest in commercial law originate?', 'Why commercial law rather than another area of the law?', 'Why do you want to be a commercial solicitor rather than a commercial barrister?' and so on. Once again, by following this approach, I would learn how to be flexible in formulating my ideas to best suit the exact question the interviewer would be asking me.
Step 3 - Mock interviews
Especially for any AC/final stage interviews, mock interviews are a really useful preparation tool. After you have improved yourself as much as you could by firstly preparing your best ideas for answers, and then preparing the best way to articulate them, you would now be in the best position to further improve both your ideas and your capacity to communicate them by getting feedback from others. Hence, if you can find someone with VS/TC interview experience (or even just experience with commercial law/interviews in general), it would be really helpful to get them to do a mock interview for you. Moreover, getting more familiar with the 'interview experience' beforehand contributes a lot to your ability to calm your nerves and do your best on the big day. As such, I would advise you to reach out to people who could help you with this, even if they are not part of your immediate circle. You will be surprised how many people will be willing to help you out!
Step 4 - Getting into the right mindset
Finally, although this may sound a bit cliche, try to go into the interview with a positive attitude. Remind yourself that just by reaching this stage, you have demonstrated to be an exceptionally competitive candidate. Acknowledge the fact that since the firm chose to meet you out of so many other applicants, it means you have everything you need to succeed - whether that means success with this particular firm or another. Finally, although I appreciate how hard it may be, try to not put an excessive amount of pressure on yourself. Meditate on your journey and how far you've come and accept that as long as you do your best, you will have nothing to blame yourself for. Going through these thought processes the night and morning before the interviews helped me a lot with reducing my anxiety and my ability to show enthusiasm in my attitude.
I hope this is useful
and best of luck with your future interviews!