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? -titles -authors -edition -publishers
2-What are really the best sources (book or books) to study and review completely college mathematics? -titles -authors -edition -publishers
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. -titles -authors -edition -publishers
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.