Knuth’s Semi Numerical Algorithms isa good reference book. Interesting read and practical. A long chapteron random numbers. One of my favorites.
http://books.google.fr/books/about/The_Art_of_Computer_Programming.html?hl=fr&id=-XxGAAAAYAAJ
Duncan's Quality Control And IndustrialStatistics. Expensive but the best overall book on applyingprobability and statistics.
http://books.google.com.br/books/ab...trial_statistic.html?hl=pt-BR&id=h2stAAAAIAAJ
I have several calculus books. The mostuseful is Technical Calculus And Analytic Geometry by Washington.Been in print for a long time. More emphasis on how to use it thentheoretical underpinnings.
http://books.google.com/books/about/Technical_calculus_with_analytic_geometr.html?id=WjjYAAAAMAAJ
When I was starting out in the early80s I realized I had no interest in any serious academic pursuits andwhat drove me was understanding how things worked. 
I was jumping into areas like heattransfer, fluid mechanics, and vibration analysis. As I was wadingthru books my great Aha! Experience. Atleast for me,was when it sunkin it was all the same mathematics. The mechanical moments of inertiawere mathematically the same moments in statistics and so on.Mathematically fluid mechanics and electromagnet fields wereidentical.
It became obvious that there were nospecial secrets, it was all the basic undergrad math sequence.Algerbra-trig, calculus, differential equations, complex variables,linear algebra,statistics, and numerical methods.
I then went back to algebra/trig andstarted working problems to get a solid proficiency. Then I wentthrough calculus again.  
It paid off in the long run. Whenever Ineeded to learn some new area it was relatively easy to read books. 
I took a night class in modern physicsback in the 90s. Quantum mechanics and other topics were appearing inengineering articles. It was anti climactic. Linear algebra,probability distributions, Fourier Transforms. 
So, if you really want to understandmath and science, start with algebra and learn how to use it. 
There is a great book written as aproject by Japanese students who had no math or science background.Background. What Is Quantum Mechanics?: A Physics Adventure .
http://www.amazon.com/What-Quantum-Mechanics-Physics-Adventure/dp/0964350440
If you wnt something worthwhile toengage in as a life long pursuit forget video games and jump in tomath. Pick a book,any book.
The net may even be detrimental. Itmakes it easy to look up short responses and answers to questionswithout ever developing any real understanding and proficiency.