3. The Mortal Instruments series by Cassandra Clare
4. The Summer I Turned Pretty series by Jenny Han
5. Heroes of Olympus series by Rick Riordan
6. The Inheritance Trilogy by N. K. Jemisin
7. Vampire Academy series by Richelle Mead
8. Divergent series by Veronica Roth
9. The Forest of Hands and Teeth series by Carrie Ryan
10. Gone series by Michael Grant
Some of these series (1, 3, 4, and 7) include books I haven't started (or finished) because I was tired of reading the newest book in one or two days, then having to wait another year for the next one to come out. But I finally decided that I'd rather devour a book than never read it.
The other ones are just books I haven't gotten to because I've been trying to catch up on review books. But I'm DETERMINED to catch up on every series on this list before the end of this (school) year.