Scheduling is essential in any learning practice. It influences on how you make the most out of your study time. I personally see “sticking to it” the most important as it reflects how disciplined and committed you are. Dividing study sessions into small blocks (refer to The Pomodoro Technique) allows you to harvest your short bursts of energy and focus. Use a pomodoro timer, turn off the wifi, and focus on your subjects.
Scheduling and preplanning work great with writing and language learning, and anything in general. Don’t forget to reward yourselves after a day’s hard work!