The phrase "mentioned areas" refers to places or topics that have been previously talked about or brought up in a conversation or discussion. Full definition
This should also mention any areas of math you specialize in. (work.chron.com)
A nursing student's resume objective must highlight his or her competence as a nurse and also mention the areas in which they are particularly proficient. (sampleresumeobjectives.org)
A Marketing Brand Manager Resume Objective should highlight the person skills in the above mentioned areas. (sampleresumeobjectives.org)