You might want to check your level before the trial lesson or just to see where you are at, but please do try to complete the test being completely honest with yourself, and you will get your result right after clicking COMPROBAR. Also, these questions are based on the Common European Framework of Reference for Languages (CEFR) that is why it is mainly grammar, but I added a couple of listening comprehension questions to the test and I personalized a bit more. However, do not label yourself (unless you need it for an official exam) in levels since there are 4 SKILLS in total, and you might out stand in some others more than with your grammar: listening, reading and writing.
Have a coffee, take it easy and enjoy!