Competencies questions answers grammar correcting

This is part of my job application that might contain incorrect grammar using, or such issue.
The writer assigned to this order MUST have such experience, and able to handle such editing.
Plz use highlight to show what you have changed, and conclude why you have made the changes briefly. Please do pay more attention on this work, as its really really important to me. Thank you.

Note: The questions and answers will be attached.