If you need ideas for challenges, check out the various reading/book challenges for 2015 listed at
A Novel Challenge blog.
I'm only 3 books from meeting my goal of 150 books in 2015. I should finish two of those in the next day or so. I set a secondary goal of 50,000 pages and I still have 3200 pages to meet that goal. There should be little problem completing that many pages by 31 December.
I also have one more book to read to finish reading all of the Honorverse novels -- well, all of those which had been published by the 31st of January.
I have decided that I'm going to put a big focus on tween/middle grade and teen/YA books in 2015. Accordingly, I'm setting a goal of 200 books with at least 100 tween-to-teen books. Same goal of 50,000 pages since the juvenile books have much smaller page counts.
I'll also set a "complete the series" goal with a couple of series which have at least 10 books in the series and which I started reading prior to 2015.
Beyond these, I'm still looking at some of the challenges listed at A Novel Challenge