Probably too much info, but thought I would post results of my first 8 so you have something to compare to as far as possible improvement:
Test 1: 17
Test 2: 18
Test 3: 20
Test 4: 19
Test 5: 20
Test 6: 19
Test 7: 21
Test 8: 23
You can see I was up and down a little but the trend is up. The difference on my last 2 was that I read the tutorial for hole punching in KBB and I started getting most of those right. With practice you should get every cube counting, hole punch and TFE right, or pretty close. I have 2 tests left to take before my test in 2 weeks, hoping to maintain 20+.