How can I fit IELTS preparation around my teaching job?

I'm from Uzbekistan and work at a primary school. I'm also preparing for IELTS, so I'd like a routine that can fit around teaching. If I have 20–30 minutes on a weekday, would you stay with one skill for several days, or rotate skills through the week? I'm also unsure how much of that time should go into checking mistakes instead of doing more exercises. Could you show what one short practice session might look like? And if anyone here is studying while working, what has actually been manageable for you?