Hmm, I'll try my best.
1. Keyhole
Definitely had some tougher, WTF moments on the real test than any of my practice tests. However the "pickiness" of the answer choices were definitely mirrored in both my DATBC and Princeton Review practice tests, so be wary of that. Be ready for some seriously irregular shapes - I heavily suggest this section last for your test.
2. Top/Front/Side
Actual test was a bit average, and a tiny bit easier than what I found on DATBC. The key to this IMO is being able to visualize the 3D shape in your mind - my progress depending on the practice test varied. Make sure you count lines and distinguish between visible and hidden creases/corners very well. Also be wary of curved shapes and slopes/triangles.
3. Angle Discrimination
Most mind boggling for me on the test, since the angles tend to have very low degree differences - was prepared well by DATBC since the angles (in the worst questions) only differ by 3 degrees. I suggest using multiple methods (drawing perpendiculars, "laptop method"/angling your head, pixel counting if that works for you, and/or staring at the apex of the angle from as far away from the screen as possible) - use DATBC's angle question generator (or ARG I think they call it on their site).
4. Hole Punching
Mirrored by DATBC the best. The real DAT had a lot of irregular foldings (reverse folds, irregular/uneven folds, and tricky diagonal folds) and irregular hole punches (punches on folds, punches in corners) that were mirrored by Bootcamp's test pretty well.
5. Cube Counting
Pretty similar, though I recall none of my figures had more than 17 total cubes (and some practice tests had it going up to 22). Be wary of edges, since two figures had those tricky "empty cube" centers.
6. Pattern Folding
Hmm, I don't recall this section very well since I finished it relatively quickly, but DATBC has some interesting strategies you can pick up on. One is "transplanting" a face and attaching it on another side, provided you make sure the sides actually meet when the shape is folded up. Make sure to look for unique shapes in the unfolded sheet and find them in the proper configuration in the real shape. Also note that for matching shaded regions on, say cubes, the conjoined areas of the cube can be rotated.
Overall I would say DATBC is about half-same difficulty, half-little bit more difficult than than the real DAT. Of course YMMV for the real test, since the tests change pretty often.
Hope this helps, I can elaborate on any other sections if needed. Best of luck studying 🙂