Up on and Upon

Up on adjective - Being up to particular standard or level especially in being up to date in knowledge.

Upon and up on are semantically related. in inactive topic. In some cases you can use "Upon" instead the word "Up on" as an adjective or an adverb or a preposition, when it comes to topics like ahead of, accompanying, higher in position, indicating position.

Upon preposition - In or into contact with.

Up on and upon are semantically related. Sometimes you can use "Up on" instead the word "Upon" as an adjective or an adverb.