Well, lets try to take this point by point to see if we can solve your dilemma.
I am going to be a chemistry TA this upcoming year but I was told that I need at least 10 completed lab reports (high school level) in order to become a TA.
This is an interesting requirement. Seems plausible, on the face of it, yet also difficult -- high school was at least a little while away for you, so its not too weird to not have saved these things. Its a funny requirement -- maybe you can ask the instructors or department head where they got theirs? Does everyone in Korea treasure their high school documents past their university degree? That seems ... useless, to me. Unless they all knew in advance about this requirement, which is likely.
I've been looking around all summer but none of my friends have any and no teachers have any.
Could you have even used theirs anyway? If you could have used someone else's data and written it up yourself ... can't you write some up yourself with fabricated data? Check first, of course, before you actually fabricate data -- you're not trying to prove for example that the water of hydration of copper sulfate is 5 moles per sulfate equivalent, only that you can write up such results properly. Hmmm.... seems like a worse and worse idea the more I think about it. You should forget I mentioned it ... or maybe ask if its OK.
Interestingly, does it have to be high school level? You'll be TA for labs, I guess? So pick five labs, do them, and write them up. You'll have your requirement, and you'll have studied for your first 5 teaching labs, so you're ready for your students. Suggest this to the department head, maybe they'll let you wait for your first month to comply, if you can't get to the lab until the term starts.
I would have done them myself but due to circumstances I am situated in Korea where a lab for doing high school lab reports is not easy to find and also the fact that I know basically no one in Korea. I am extremely desperate and I will be so grateful and willing to do anything for anyone that can provide these for me.
So you need us to execute 5 high school level labs, provide you with raw data, and you'll write it up? Or do you want us to do it all for you? We don't do that here, you should check the forum rules.