When it's used at the end of a sentence, "though" means approximately "however", or "despite what I just said in the sentence(s) before this one". When it's used at the beginning of a sentence, phrase, or clause, it can also mean "despite the fact that", and means the stuff immediately following it may appear to contradict the rest of the sentence.
It's used when what you want to relate the two and want the reader/listener to realize that they appear to contradict each other, and you know that, but both parts are true.
You can often use "but" to string the two clauses together with a similar meaning. For example:
I don't like pizza. I ate half of one today, though.
means I don't like pizza, but I ate half of one today. Note that without the "though" or "but", you have "I don't like pizza. I ate half of one today.", which appears to be a contradiction. (Pizzas can be pretty big. People who don't like them generally wouldn't eat that much of one.)
Though I don't like pizza, I ate half of one today.
means the same thing.
The most-used word (by American teenagers) is "swag".
The hyphen causes "most-used" to be treated as a single adjective. You can see this in phrases like "a two-year-old child", "like-minded individuals", or the song "Fat-Bottomed Girls".
And I do agree that "by American teenagers" sounds a bit awkward in the middle like that. "The word used most often by American teenagers is 'swag'."
Best Answer
In the context of your example, in the UK* we would typically use the word Year, e.g.:
(Though,
Year 11in the UK would be roughly equivalent to10th Gradein the US)Grade would typically be used to describe the results of an exam.
*more specifically, in England, since education in the UK is devolved to each of the home countries' respective governments.