I am not familiar with Riya Education so I cannot say anything about them.
Studying in Germany in general can be a good idea. They offer high quality education. If you want to study in Germany for a longer period of time I would recommend that you start by learning some German language. We can help you to study at selected universities and language schools in Germany. Fill out our information request form if you want help.
Read more:
German Language Schools in Germany
Study in Germany - list of schools and universities