Last minute studying

Sounds logical this is bad, but not always.

When it works

If students are unmotivated and rely on the acute stress to motivate them, this can be pretty valid.

When it's bad (only by itself)

In terms of formal logic, rather, the lack of non-last minute studying for exams that cannot only be last-minute studied is bad.

Still...

Better than nothing, can also combine with long-term studying to refresh hard topics into the mind before the test!