Going to talk about school math.
I'm at school before math was taught in the books without a teacher, people say, "Why do you need?", but I continued to teach. In the end, the sixth class to a derived came, everyone knew, except for geometry, because I read only algebra. In the 10-11 class as the machine solved the problem very quickly, seemed more basic. So, from personal experience, I think ideally you should have this:
1. Go from simple to complex. For example, first learn the table of addition, then multiplication(Yes some of them do not know it), then learn how to calculate the sum of natural numbers, difference, multiplication, division; understand how is the power of the number; after study of the same operations for all integers, then for a decimal floating point numbers, etc.
2. If in some book too many new and obscure concept it is likely that this book is not yet for you. Take it easy book. I'd recommend books on the school curriculum or a great book-encyclopedia across the curriculum. Ideally, you should have a reference book (which has all the formulas if you forget), the book-the theory and the book-an exercise book (the last 2 often in one book). There should be a notebook for notes (+crib) and a notebook for tasks.
3. Are incomprehensible sentence, clause, phrase. It is inevitable. When you see this, re-read several times, slowly delving into every word, try to take a pen and work out, to figure. If you do not understand pause, switch to another, then return . If still it does not work, then clearly specify what is unclear and ask the teacher or on the forum somewhere.
4. Practice. The human brain is inclined to forget, so secure knowledge outline. Found out some kind of algorithm, just get yourself a task or take a book and try to solve. More hardcore: read some of the proof of the theorem, try to prove yourself without looking in the book. To fix better (according to the degree of practicality): algorithms for the solution of problems, formulation of theorems and definitions.
5. Learn to solve without a calculator. Sometimes it is impractical (for example to calculate the sine of 20 degrees), then you have to use a calculator or table, but in other common cases it's better to get used to the calculator.
6. Occasionally pause and double check yourself, well I mastered the material or not, but after the logical end of Chapter, course, section, etc. (well you get my point).
7. A very good sign that is what you are looking for a task, can immediately understand what type belongs the task, by what method can it be solved, and confidence that will solve this problem.