Not so much advice, just some info on my experience. In my invite email to do the online tests (VSE/M7SJT) there was a link to a sample paper which demonstrates how each test works. This was definitely useful, especially if you've not sat those types of tests before.
The M7SJT gives you situations and you rank the given responses in order of what would be your most likely response, second most likely etc. They don't give answers to the sample questions - they claim there are no right answers but really they want to understand how you think. You can probably figure out what they're looking for but there are still a few judgement calls so I'd suggest you make sure you can justify your selections should they ask about them in an interview.
The VSE part of the sample paper is hard and fast paced. I ended up downloading a metronome app for my phone to get me working at the required speed lol. They do provide answers for those. Print several copies, get a pencil, find a quiet room and practice! I practised these variously for a week including on the morning before I did the test. I did the test in the afternoon - turn your phone off, get a quiet room, close the other apps on your computer, and close the door then do the test without distraction. This is the key thing - you're concentrating on each part of the test for about 10 minutes without the ability to pause so make sure you won't be distracted. They also give a load of advice before starting like making sure you have a stable internet connection, and use a mouse not a trackpad.
I found the online test itself easier to follow than the paper version, which made the paper version very useful preparation.
Hope this helps