If you are coming as a trainee only for 6 months then the offer is ok. If you are planning to continue and stay for long then the offer is too low. I know you will be getting accommodation and transportation but your expenses for food will take a major portion of what you are getting even if Indian food is comparatively cheaper. You might be able to save arround 1000 riyals per month. Six months stay as Management Trainee is justifiable with the package as you can still save something.