Advanced and Multivariated Calculus

I always liked math. Since my childhood, i was (and i am) "good with the numbers", i found it more funnier than memorize important dates of history, or write short stories, or memorize the bones of the body. That is the reason of why i choose this subject as my favorite, and the discard, because unlike to the others (Statistics, Laboratory, and different Chemistry subjects) is the best... (for me).

The subject is "Advanced and Multivariated Calculus", and basically we calculate area, volume and points in space (usually in planes). These values are calculated using "the next step" of derivative and integrals: partial derivatives and double integrals. Also, the classic variable "x", is not alone, now is accompanied with other variables ("y" and "z", sometimes "t", or sometimes we change the variables to "u" and "v").
The main contents we have seen in the subject are:
1) Vectors and vector functions.
2) Partial derivatives.
3) Double integrals.
4) How to applicate these tools to calculate the volume or area of a surface.

Well, i'm not sure if these are the contents, because i don't remember the program. But this is the essential.

Like i said in the start, since my childhood i liked the math. I guess because the answer is just a one, or two, i mean, the answer is objective. They are many ways to do the operations but always are the same result.