Hi!
Medify exams are usually harder than actual ucat. The score I got on the actual exam was the highest out of all the mocks I've done on medify. I'm sure you will be able to get a higher score in the actual exam. I know it's stressful but don't give up you can do it! Have you also tried watching some youtube videos showing people doing ucat tests? It helped me a lot with the thought process of doing the questions.
I think being able to answer every single question is the most important. Even if all your answers are "C" you'll still have a 25% chance of getting them right. Don't worry about your accuracy too much as ucat has an insane amount of questions and there won't be enough time to dwell on them. Remember to use those keyboard shortcuts as they're great to save your time. Here are some tips hope you'll find them useful.
VR: Using the cursor to track your reading may slow down your reading speed sometimes
DM: Use of elimination when you're stuck and don't hesitate to draw diagrams/tables in some questions
QR: Practice how to use a keypad quickly and calculator memory shortcuts
i.e. P = M+
M = M-
C = recall stored value
CC = clear memory
AR: try jotting down the patterns after you've done the mocks revisiting those notes may remind you of what kind of pattern you need to look for / you're weak in and also the acronym SCANS: Shape, Colour, Arrangement, Number, Size
STJ: write down the scenarios and their answers so you'll know which aspect weighs more than the other