Reply to thread

For your question more specifically, it is difficult to say what you should focus most of your efforts on as different firms weigh the assessments in different manners. If you can, I would advise you to reach out to current/future trainees to see if they have any advice and to ask what they think the firm places most emphasis on. Besides this, in deciding what to invest most of your preparation into, I would consider the following two factors:

1. Consider how well do you rate your skills for each of these types of assessment. You do not want to score excellently in any assessment at the cost of scoring poorly in any other, so I think you should aim for a good performance in each rather than an extraordinary performance in any given one. As such, it would make sense to invest more preparation time in developing the skills which you think are your weakest.
2. I would say that in absence of reasons to think the contrary, there is an argument to be made that the partner interview is the most important one to score well in. This is because partners are normally the ultimate decision-makers. If a given recruitment partner really liked and wants to hire you, it is unlikely the firm will choose to reject you just because you did not score as well as another candidate in the group exercise; although bear in mind this is more relevant in the case of smaller rather than larger offices, as the latter often have more standardized and formalized recruitment decision-making schemes.