The knowledge part it was weather. It's so damn boring that I could not learn it for my life. I'm not talking about reading METARs and TAFs. I'm talking about fronts, cloud types, fog types, etc. Luckily, my DPE didn't get into any kind of depth with any of those things.
Flightwise... the landings as most other students. The flare was either too high (usually) and a thump, or not enough or too late and a small bounce.
Why do you ask? Are you training or looking to start? After the fact, I can say that it's really not that bad. Now, almost a month after my checkride, I wonder why it took me so long because it's really not that hard. It's easy to say that now once it all clicked, but when I was struggling, it seemed like it would never come together. I think most of all had moments where we considered if this is worth it or if we should just give up. I know I did.
If you are struggling with something, I promise you that it will one day just click, but stay with it. Don't get discouraged and don't give up. Practice makes perfect (or at least better). Good luck.