Is it possible to reclass to 25D or 17C from 68C?

I’m going to tell you right now, as someone who has recently graduated from the 25D course, throw all you know now out the window completely. The main focus that I would say you need to know is Linux (a lot of Linux), windows command line, packet analysis, windows artifacts, and so much more in depth that will be too much for this post. It’s going to be rough, and depending on when you go, at least for me, it was completely virtual due to the pandemic.

I was pretty much in your shoes when I attended the course, I was halfway through a BS in Cyber Security and had my SEC+ certificate. My biggest suggestion is to make sure you have good study habits and be ready for the course to dominate your life for the time you are there. They are continuously changing which SANS certificates are mandatory so I can't speak on them specifically, but it is doable and takes a lot of effort.

Do it! I have no IT experience, but working through a BS in Cyber Security as well as 11C and I'm about to drop a packet