With passing levels 3-4-5, you have entered the Intermediate level, well done! This really is a turning point in your journey as from now on you are able to read and write Han Zi, these beautiful Chinese characters. Understanding Han Zi has broadened and deepened your understanding of Mandarin massively. You might even have found out that Han Zi really is the core of the Chinese language. You now already know about 625 characters and your vocabulary contains 600 words, your grammar has reached an impressive level, as have your listening skills and speed of speech.
With all this you can talk and read in a more than basic way about many things, for example, you will feel comfortable when traveling in China because you can deal with most topics you run across, like buying train and plane tickets, booking a room in a hotel and making a reservation for a trip.