This is the 1995-96 Putnam exam. On average, Putnam problems are somewhat harder than U of Michigan problems. As far as I know, we've managed to solve A1, A5, B2,B3, and B4. Here is how many of the top 204 contestants scored 7, 8, 9, or 10 on each problem. B1 and B5 are apparently pretty doable.

A1	199	B1	157
A2	50	B2	82
A3	178	B3	80
A4	61	B4	93
A5	5	B5	96
A6	2	B6	5