Your lexile number is very high for a 9th grader. A 1300 is a 12th grade reading level, very impressive!!
The best way to maintain/raise your lexile number is to read a variety of literature. I would suggest reading books that are of a higher reading level than your current grade (take a look at your schools reading list for juniors or seniors). Also make sure you read not only fiction, but non-fiction(bios, newspapers, etc.) as well.
Here is a site that actually lists books by lexile number if you want to know where to start:
Just put in your lexile number on the first page, choose the genre you would like to search, and the site will automatically generate a list of books that are at your lexile level.
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