Yes, it is also important to speak, not so much because that is the ultimate goal of learning but because it does 2 things:
– when you speak with someone in reality, you can gauge your progress. You know whether you have or haven’t made yourself understood. You know whether or not you got your message across. You know whether or not you were as capable as you’d like to be in persuading the other person of what you were wanting to say. And it doesn’t take a language test to do this: your brain comes fully equipped with an automatic gauge so you can judge that in a fraction of a second.
– you understand when you’re talking to someone of another nationality the real importance of being able to speak, and speak well and that natural desire will motivate you.