If the LMS has a "path to certification" where a student has to pass one course (group of skill sets, techniques, belt). My guess is that it should be possible to track the individual techniques by students. It may look something like
Lesson #1(Chapter 1):
- technique 1 (test or satisfactory approval)
- technique 2 (must past technique 1 test before technique 2 is available, or not)
- technique 3
Once the techniques are done to your liking then they can get access to Lesson #2. The other option would be to have Lesson 1 without any technique requirements, but the techniques won't be marked as complete until the student is able to to it. That way they student can still move forward with the understanding that there are some previous techniques that need to be addressed. This would allow students to learn techniques at a different pace, some techniques I do better than others. For me some basic techniques are more difficult than some advance techniques. Sometimes I can do a technique better on my non-dominant side better than I can do on my dominant side.