This question is not clear. Kindly update it with all the relevant information and re-post.
Disinterested
This is entirely useless!
No, it is not. The word entirely is an adverb.
almost entirely
No continent can be entirely in two opposing hemispheres. Entirely in Northern: North America and Europe Entirely in Southern: Antarctica and Australia
surrounded entirely or almost entirely by land.
Entirely possible, yes.
That is entirely up to you if you would like to accept or not.
Entirely in the Northern Hemisphere: North America & Europe Entirely in the Eastern Hemisphere: Australia & Asia Entirely in the Southern Hemisphere: Antarctica & Australia Entirely in the Western Hemisphere: North America & South America
If you're failing classes in your intended major, you really should rethink your major or school all together. Are you failing because it's too hard for you, or because you're uninterested in the subject, or because you're uninterested in college in general? If it's college in general, stop wasting yours and/or your parents' money and take a break until you're ready to be serious with school. If it's that the classes are too hard, look into more remedial classes to prepare you for the tougher courses or reconsider your major entirely. If you're finding the classes completely uninteresting, then it's definitly time to switch majors. In short, no, it's not normal to fail classes.
No continent can be entirely in opposing hemispheres.
Antarctica is almost entirely desert.