If I had some time, I would learn the language, which is totally different from using it for MCU. That would be like learning French and working in a French restaurant. You learn the language first, then use the language to do stuff or learn more things. I suggest C++ from the ground up by Herb Schildt. You're EE so you will appreciate his clarity and logic in his book. MCU can be programmed in a number of languages besides C.