I would like to buy references in order to review and study mathematics I am an ESL learner and most of the time I am able to understand English but In my courses, we don't study mathematics, and I think that it is a mistake or wrong.
1-What are really the best sources (book or books) to study and review completely high school mathematics?
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2-What are really the best sources (book or books) to study and review completely college mathematics?
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3-What are really the best sources (book or books) to study and review completely university mathematics; the basic courses before to study a specialty in a university for example. I ignore how matematics courses work in an American, Canadian or English university.
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4-What is or are the best calculator or calculators? I mean software applications used to calculate or the usual electronic device used in university courses? I know DreamCalc but are there others? I know what is spreadsheet but is there a better thing that I can use? I know of the IrisPen to develop solutions to math problems using a computer but is there a better thing to use? 
I sincerely thank you to develop extensively comments and suggest really good books, products, software applications and os on.
 A: Hi
1) "High School" Math really varies from region to region, but if you aim is the review for University, you should get any book on analytic geometry, or "college" algebra.
2,3) Calculus and Linear algebra make up the bulk of first year University Math.  Any old edition of "James Stewart Calculus" should suit you fine.  I think David Lay's "Linear algebra and it's applications" is also pretty good.
4) Most University math is done without a calculator, but some students purchase the computer software "Maple" as an aid.  Maple is easier to learn than other programs like Mathamatica, and you shouldn't need anything more advanced than this for intro college/university
A: At first when I had the idea to ask this question, I tought about books such as Schaum's Outline of College Mathematics and other books of the same kind for high school and university mathematics courses; then I found out this Website and I had the idea to demand to "math experts." I knew Mathematica, this great math software application, but I am also happy that you talked about Maple that also really seems to be a great tool too. Thank you to tell me that Maple is less complex. At least, it seems that they developed portals and resources for students. It "sounds" great. In practice it is sometimes "another game." In my opinion, I suppose that someone who buys the IrisPen to develop math problems on a computer and on paper, and that is also enable to use an application such as Maple 14 Academic or another version is really in a good position to be good at solving math problems and tasks of the like.      
A: A nice starting place is the collection of notes by William Chen. It covers most of the undergraduate curriculum (and somewhat before) in a really accessible way. The Trillia group has a collection of nice texts too.
