How can I replace 3 cascading dropdown menus?

I have a big form where the user must select a category and a location, each have 3 levels, user must select the first option that enables the 2nd and then the 3rd one. Each dropdown have at least 5 options.

I have this situation both in desktop web and in an android tablet. I would like to find a way to improve this kind of selections in order to simplify this process.