I recently bought myself this book, The Only Grammar book you'll ever need by Susan Thurman, from the writersdigest.com and I must say I am pretty happy with it. It told me everything I wanted to know, so I can use it as a quick reference from now on. Every time I am unsure of something, I can just go look it up. I am definitely not memorising everything.
For those who might want to know, it is a paperback with 184 pages and it addresses every writing dilemma imaginable.
