Topic of Interest Book

I just started reading my final book for my topic of interest. I know it may seem like I'm starting on it really late, but I've found that once I pick up a book I can't put it down until I'm done with it. If I start too early, I'm done a month before the book is due and I tend to forget the small details that would benefit my essays the most. Last semester, there was one book I read before the deadline was even set for our independent reading essay and I ended up coming into school one day and being told that I had to write an essay. I had completely blanked on the day it was due and hadn't worried about it because I had been finished with my book for such a long time. The last book for my topic of interest, I read the weekend before the essay and it was probably the worst essay I wrote all year, not because of the time constraint I put on myself, but because the book didn't offer as much information about my topic that I thought it would. I'm actually a lit bit nervous about finishing my current book because it's almost 1000 pages, but I know I'm going to get it done because not getting it done is not an option. I'm decent at coming to conclusions based on what I've read, but if I didn't finish the whole book it would feel like telling a lie because I would know that I hadn't gathered all the information possible. Anyways, I'm really excited to get into the book. I'm happy I chose gangsters as my topic of interest because I find their lives fascinating and completely unlike my own.