I haven't heard of a full 42 but I know that someone got 40 this year. Some other people got 38s and 39s. (Minute amounts, they're most likely outliers)
Just do your best, some ppl are more gifted in terms of the skills that are needed. Some are less fortunate. Do lots of practise and make sure you're in a healthy state of mind on the day. MCQs are very unpredictable, so luck plays into it a little too. There's no one "formula" for achieving a high LNAT. You can only do what works for you.
Best of luck.