My height is 5 feet 6 inches. Is it good for a IX grader? Do you think I good ever become a model...?

Your height shouldn't hold you back from becoming a model. Some of the most beautiful women on TV are your height. They all modelled before becoming TV and movie stars. Check out Eva Longoria (Desperate Housewives). She is probably even shorter than 5'-6" and she is stunning. If you want to become a model, you should try a modelling agency to see if they can get you some work.