I have rapid certificate but when I try to attempt for intermediate $150.00 is being charged. But somewhere probably it was told that level can be upgraded without any cost. Kindly let me know the procedure for leveling up free of cost.
I'd advise you to contact the Academy directly. As stated in the Intermediate certification page: "If you have any questions, please don’t hesitate to contact us via email@example.com." They probably know best to answer your question about the costs.