I like to working in a professional environment towhere I can study and contribute. I like working in a professional environment where I can study and contribute.

Your original sentence is correct, but this one "flows" better.

I like to work in a professional environment to studylearn and contribute. I like to work in a professional environment to learn and contribute.

Learn is perhaps a better word here than study. We often say study for schools, or university but learn when its related to work.

I enjoy being a part of a successful and productive team, and thrive in a highly pressurized and challenging working environment. I enjoy being a part of a successful and productive team and thrive in a highly pressurized and challenging working environment.

I enjoy being a part of a successful and productive team, and I thrive in a highly pressurizedfast paced, dynamic and challenging working environment. I enjoy being a part of a successful and productive team, and I thrive in a fast paced, dynamic and challenging working environment.

This sentence could be improved in this way.