Guessing q's when doing mocks

Sorry if it sounds dumb but I genuinely want to know if it is normal to guess or spam a choice for unanswered questions when time is running out.

For AS levels mcqs I never guess during mock practices because I want to make sure that all of the points I get actually come from my knowledge, but the situation seems to be different for the ucat cause of the harsh timing. So yeah that's why I want to know if you guys usually guess the remaining q's while doing mocks or not. (doesn't have to particularly be mocks, maybe even short timed practices on medify)