Supervising a lazy BSc student
Things like that happen. (Also, as mentioned in the comments, you might be wrong on the reason of their behaviour.)
Close mentoring

Assign meetings, say, weekly.
Make it very clear, you want to see some progress each meeting.
Steer the student in the right direction in each meeting.

You'd need to define their topic, the extent of work, etc. early on. No freedom, no &quot;choose your own topic&quot; – it's already too late for this. Pick one, make sure the student is Ok with it, say &quot;go&quot;.
What I also tend to do after the topic definition: Elaborate on the amount of work. &quot;If you do this, this, this, and this, it's an A&quot;, &quot;if you do only this, it's an F, I need at least that and this additionally to let you pass.&quot; Notice, that &quot;having written the actual thesis at least okay'isch&quot; is one of those things they need to pass. Do not forget to mention it!