Check box obscured
In some multiple choice question the lowest tick box obscures the check box and it is impossible to continue or skip......I can only skip and repeat hoping I don't get the same question.
Try to zoom out (CTRL-)
Yes. It is also possible to press keys. For instance, to select the first and the third answers, you press 1 and 3 then Enter (to un-select an answer, press the same number again). It is even much faster this way than with the mouse. Especially useful during a timed practice.
Is this using the website or the app? Try fiddling with screen/window size.