I'm in the military and it's incredibly difficult. I'm fortunate that I currently have a job with a predictable schedule (usually it's not like that) but I found that I wake up early around 0500 to 0530 and study until about 0700-0730 and study at n…
Just remember your end goal and what you're willing to do to get there. Take a few days off if need be but don't lose focus. Focus on what your weaknesses are when studying.
7sage has a practice timer that will do that you can download from their app on Apple or Android store.
Edit: I could have sworn I saw that option somewhere on here but I can't find it.