Looks pretty good to me. I take it this is for an interview?
I'd suggest just a slight tweak to make yu sound a bit more professional. Change:
'My goal is that in five years I will be working in a supervisory position in this company provided that I will work hard and do my best.'
'In five years, I see myself working as a supervisor provided my hard work and dedication meet the company's standards.'
Student or Learner