I agree about the psych evaluation. But regarding the exam: a politician is basically a combination of manager and sales person. Of neither role do I expect (deeper) understanding of the things they manage or sell. They need different skills.

But they need to listen to the experts in their ministries and be able to convey their results and concerns to other politicians who are even farther away from their topics and to the public. What they absolutely should not do is push some own agenda; especially not an agenda they somehow profit from.