I have too many apps and would like to combine or eliminate a couple. In particular Quickbooks, Office Moble and Google Drive can one of them be combined with the other?
Well, Drive is a cloud storage app. It doesn't really have any similarities to the other two. As for Quickbooks and Office Mobile, looking at the descriptions, they are just different enough where one can't really be used over another.
One way to look at it is, how long has it been since you have used any of those apps? I would suggest keeping Drive, due to the amount of free storage you get, versus other cloud based servers.