Work with the time you actually have
If your schedule is tight, the most common mistake is waiting for the perfect study day. That day rarely appears. It is better to accept that you only have short blocks and build a routine around them.
Fifteen or twenty focused minutes can be enough when you are consistent. What does not work is studying a lot once and disappearing for the rest of the week.
Split each session into three parts
A simple structure works well: . That prevents your session from becoming only passive reading or only mechanical answering.