My son also studied a few months. Our view is the effort made by the parents is very critical as the interivew class just tell you the types of the questions. Parents have to practise w/ the kids at home. And 1 pt I am sure is the interview class won't provide fixed answers. I think the use of interview class is they provide the scope/resource of the interview questions. It may help you about 10% of the whole process. The key still relies on the parents.