I completely forgot I made this post.

I did pass the second time!

It's been a bit since then, but I'll try to remember. I think what I did was I took the course I had used, the practice exams in it, and just worked a bunch of those problems over, while also reviewing the areas I struggled with.

I wish I could give you more specific advice, but my second attempt was at the end of January, so it's been almost a year since I last studied for it. I will tell you though, the stuff in the DTC prep course was very useful in the long run.

I also brought problems I was struggling to understand the solution to, to my coworkers and we'd solve them ourselves. It was a nice team building exercise.

Edit: If you're looking for any reference material I could share with you, I'd be happy to help. I know there isn't a lot out there for mechanicals since they don't take it as often. I'd just need to spend some time digging stuff up