There are online free versions of these tests to pratice and they give you feedback, I suggest he does some. Also if he searches up on YouTube, aptitude tests for finance (these are often used across industries) and also some for engineering there are videos with lots of tips on how to do well.
https://www.graduatesfirst.com/
You can make an account and access free ones here, they have paid things but lots of them are free and you can do I think at least each one twice. But I may be wrong on that.
https://aptitude-test.com/
Also, ZeroGravity is a free platform for students from Y12- post degree, he should make an account. It has free mentoring from a student whose done or is doing what you are applying for, so at uni on x course, or on a degree apprenticeship. Also they have lots of different very organised forums, where people in uni/degree apprenticeship, on grad jobs, in 6th form etc, ask questions, get advice from others, also older students post resources for free, people ask for help with neas (generally), personal statements to be read, again help for interviews. Once you get a mentor they can do pratice interviews with you, help with cover letters etc. ZeroGravity also works with lots of companies who do exclusive webinars and talks online and in-person for free, so there are some on these aptitude tests, maths tests, again ones specific to industries like software/CS, engineering etc and from companies in that area, and also from people on those apprenticeships now giving their tips. Again also for interviews and other application stages. They also offer like opportunities with brands, which they may prioritise someone from ZeroGravity (no criteria to get on the site), or only have exclusive to ZeroGravity and other sites they work with, in-person and online, building your CV etc, networking events, all sorts. The more you use the site, the more offers they give you.
Anyways I sound like I've designed it, but it's just really great, and I and many people I know have gotten great benefits from it, I also mentor students on it, would highly recommend. Another one is Futures for All (formally Speakers for Schools) and Springpod, offering in-person and virtual work experience, events, useful webinars etc.