This is a book where you will find many solved exercises about Algebra, Linear Algebra, Calculus and Mathematical Analysis. It is very useful for all those students needing help and support. The exercises are solved step by step, explaining how and why the exercise is solved by this way. It's not a theory book. And you will find exercises about: equations, numbers satisfying any conditions, non linear system equations, vectors and algebraic geometry, integral domains, Diophantine equations, linear algebra, absolute value, inequalities (any of them using absolute value), limits, continuity, function domain, derivable functions, study of a function (maximum, minimum, increasing and decreasing intervals, concavity), series and integrals (any of them using Beta and Gamma functions).