Hi Torsten! I’ve been studying English for years, I work with this language and I can say I’m good at it because I’ve got a degree and I am able to speak English to communicate with people from all over the world. Yet, I always try to keep pushing myself a little more every day and it’s not true that your “basic” exercises are too elementary. No one can really claim to know everything: there’s always something new to learn, be it a nuance, an idiomatic expression (who knows all of them???) or a new technical term, etc.
I’m enjoying the exercises. Although some of them might seem easy, there is always a sentence with something worth learning or reviewing. For example, after I took the say/tell test, I read all the sentences again and stop to memorize a few of them which were of interest to me, in spite of the score (10 out of 10). I didn’t know that we can say “Now that would be telling but my lips are sealed”. Although I got it right, I had to think it over.
Reviewing is essential. Anyone can forget anything. Besides, different skills need to be assessed. A good writing score doesn’t necessarily mean that the same advanced level is achieved in a spoken interaction, so it’s advisable not to overrate oneself!
What I try to do is to vary the exercises I’m doing, by practicing each skill. I congratulate myself on completing a test in a short time but I attach more importance to being able to speak fluently, without having to think too long to utter a sentence. Anyway, even a mother tongue has to consider and look up a word or two, there are so many subjects to talk about. I know people who are experts at, say, mechanics and they talk about it at an advanced level. Yet, they can be not so good at talking about anything else!