Fluency (i.e., speaking without hesitation and pauses) is only one factor contributing to overall language proficiency. It is a very vague term if used standalone. In the Tracktest exam, fluency is assessed in the Speaking part of the test together with accuracy, range, and coherence. In the CEFR scale, you are expected to have a reasonable degree of fluency at the B1 level, and it should improve higher up.