forget maths for now that will come with experience , just learn the basics , flush draws,straight draws,odds to hit set etc etc
Super system is still good for learning sound fundamentals.
John Vorhaus books good for learning about yourself and your poker goals,he does the killer poker series.These books help you explore how you think and feel about your game and how your moods etc affect you and your game.Killer poker:strategy and tactics is a good one to start with,in it he generally gives you exercises and questions to help you understand how you play and view others.
Theory of poker by sklansky [still stands the test of time]
Forums - here ok , you get varied opinions.
2+2 although just read posts for a couple of weeks to get a general idea of questions to ask,then try to be as active as possible in the threads and your knowledge will come on in leaps and bounds.
PokerXfactor - very good training site for mtts and sngs,plenty of quality videos by articulate instructors who know what they are talking about.Also a handy replayer to download your hand histories into and review you can also ask on pxf forum the pros questions on hands you"ve played or ones they have played in the videos that you have watched [ask about any concept your not sure about] Also the videos are by different style players so you can relate your own game with some and the others like say belowabove give you a good insight into how effective very loose lag style is if used properly.
If your really intrested in the maths and probability in poker then Ross, Sheldon. (2006) A First Course in Probability is the one.......(Sixth International edition) Pearson. Library reference: 512.73 ROS
This is a highly recommended book on probability. It has a beautiful presentation of theory and lots of exercises. Unfortunately, it is rather expensive to buy so look at the library copies first.Its heavy going though,or books by bill chen are ok.
site good for reference -
http://probability.infarom.ro/gambling.htmljust select the odds tab.