My advice, would be to firstly, make sure you know what the role involves and seriously consider if you can commit to shift work, and lots of hard intensive work too.
If you decide to apply, take your time to read the application form, and draft responses for all of the questions, making sure your responses follow the theme of what they are looking for in a driver. Also include a CV and cover letter to send with the application. If you make it to interview, you will be asked questions on your cv/application form.
Study hard for the assessments if you get through the application sift.
If you get through the assessments, you need to study every thing you can about the company. I got to the point where I wrote every piece of company information down, and re-wrote it down over an over till I could do it all from memory. And I still missed a few bits out in my interview. I passed my second interview and start training in march next year.... can't wait!
It's a long processs sometimes, and staying in touch with the recruitment team, asking them questions like when am I going to be interviewed, will show them you are dedicated. If you fail an interview, as I did, ask for feedback. They will give you constructive feedback for your next interview.
Good luck if you go for it.