DO NOT pull an all-nighter. As much as it is good to prepare for the LNAT, it is a test of natural aptitude so if you've left it late, there's not much to do. If you are a competent student who has done alright on exams - have faith in yourself that you are fine. Additionally, most universities (except oxbridge) are only aiming for just above half marks so no need to stress about not getting 90%+. My best advice for you is to do a practise paper today (do the simulator on the LNAT website as I found this the most similar to the actual exam) and really focus on the types of questions you are repeatedly getting wrong. Whatever you do DOT NOT compromise your sleep. It is paramount for you to get a good night of rest as the LNAT is also a test of your mental stamina which will be greatly impacted by lack of sleep. If you sleep well, you will be more able to interpret the passages and use your brain to choose the answer. Please please please do not pull an all nighter. I understand the appeal, especially if you feel unprepared but unlike most exams, you do not need to know ANY content for the LNAT so there is absolutely no benefit to staying up all night. Please trust me on this. In short, do a bit of practise tonight and rest well. Have faith in your ability to tackle the questions and most importantly you've got to reassure yourself that it's just an exam. The likelihood is you will be fine but worst comes to worst, there are unis that don't even require the LNAT. Please let me know if you want any more tips or to chat more. Rooting for you!!