be able to start learning C++?

I am having High School Final Examinations in June, and I have to learn HTML and C++. The problem is, in my book about C++ it says I have to know C before starting with C++. But I'm afraid I will not have enough time, because I have other subjects as well. Currently I have almost no knowledge about either C or C++, although I am very good at HTML, and web design in general.

Please, tell me if I can start learning C++ without having to master C. It is very important to me. Thank you!