A B1 level student can produce simple connected text on topics that are familiar or of personal interest. So it's basically things about yourself, a fairly simple text in which the ideas are connected. And also, a B1 student can describe experiences and events, dreams, hopes, and ambitions - briefly give reasons and explanations for opinions and plans. Now let's now compare that to C1. This is the common European framework description for C1 abilities. so if you're at a C1 level, you should be able to do these things.