Typing: How I study during the vacation

I'm studying English by using textbook in this vacation. It's not new textbook because it is for third grade high school student. I took monthly correspondence education when I was high school student, but I didn't finish it all. The difficulty was too high, so I gave up to finish it. I thought it might help my current study, so I'm studying with it. But I feel it is very difficult even now. I must remember many words and keep working. There are about 8 books, and my target is finishing them all during this summer vacation. I hope it grows my English skills.

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