Sure you have a benchmark. What is the asset allocation of the hypothetical portfolio? Go make a similar allocation benchmark from public indices and calculate the metrics for those. For instance, let’s simplistically say the institution has a 60/40 allocation to stocks and bonds, all domestic. Do a weighted average of 60% S&P500 / 40% Barclays Aggregate and calculate the Std. Dev. and VaR, etc. of those. I assume your case study gives you info like it was 3-year, 5-year metrics, etc. Then compare your portfolio to those.
As in the real world, analysts and investment leaders must make stuff up on the fly. There often is no template or “right answer.” They are testing your creativity as to how you’ll attack the problem.
Do the above then post back. Happy to answer questions if you supply more details, within reason.