hi! also doing the lnat
but tbh the best practice I'd find would be timing yourself on part a (there's a mock test on the website, I'd recommend 8 minutes per question set)
and part b is online too, you don't necessarily have to be well read on the topics they give you, I'd just practice typing! the best lnat essays are usually about 500-600 words which sounds like a lot to do in 40 minutes 💀 but it is doable! generally get lnat past paper questions for part b, open word and set a timer for 40 minutes, and set 5 minutes for planning, you get a whiteboard to do that on in the acc exam I think