Hey, don't worry, the 2nd sample I found difficult too.
On the first, I got 26 and then a while later (so I'd forgotten the answers) I got I think it was 30 and 34.
On the second, I got 17, 17 and then I left it for a good while and stopped worrying about the LNAT, did it again and got 35/36.
I did a few of the old ones from when they only had 20-something questions, and got 12, then 19.
Your scores will move around a lot. Just get as much practice in as you can, and see how it goes on the day. For me, I thought the real thing was a lot more straightforward. Plus I must've scored highly, because both my LNAT unis took me and one lowered the offer. Don't let a few sketchy scores dishearten you, I'm sure it'll be fine. Also, provided the rest of your application is good, as long as you're above 20/ the low 20s I'd say you'll likely be pretty secure. Good luck