I also haven’t done the SCA/SCE in SLES15 exams as I gained those certifications a while back by passing the SLES12 to 15 Update exam to upgrade my SCA/SCE in SLES12 certs.
The first thing to note is that the SCA in SLES15 was recently revised with a new 2025 version now preferred - the previous version will be retired at the end of this month so make sure you know which you are studying for.
The second thing to note is that the exam is Q&A based rather than practical so whilst they can still cover a lot it will be limited. Saying that though practical experience will be helpful and is expected.
If you have access to the official training material then you are in good shape as that should contain everything that could come up in the exam.
To add to @malcolmlewis’s reply:
- RPM is a package format and the rpm command can be used to work with package files whereas zypper is more joined up dealing with dependencies, etc.
- enabling a systemd service will mean it starts on boot whereas starting a service starts it now (so you need to do both if you want a service to start now and when the machine reboots)
Basically make sure you’ve read the exam objectives at either https://www.suse.com/training/exam/sca-sles-15-retiring/ or https://www.suse.com/training/exam/sca-sles-15/ . Research and practice what you’re unsure of and when you think you’re ready take the exam. Good luck!