RM130/month (4 lessons each month, 1 hour per lesson)
Monthly fees stated above exclude one-time off registration fees and one month deposit.
Adult classes are often "non-syllabus", which means that you are not being prepared for ballet exams to advance in grades. If you do want this, speak with your ballet teacher. However, a lot of adults prefer the free form and relaxing nature of not having to perform to any particular standard other than their own self-satisfaction.
Do everything at your pace; it doesn't matter how advanced anyone else is in the class - it is not a competition. You'll "catch up" in your own time and your own way. It is also important to understand that there are some things that you may never be able to do, such as the splits. Don't sweat it, just accept this.