The TOEFL is aimed at students with a C1 or C2 level, so if you’re really at B1, it would make more sense to continue focusing on *learning English* rather than attempting to beat the test. Once you’ve definitely reached the required level, then it would make sense to familiarize yourself with the exam, practicing the specific skills that you’ll need so you’ll be ready on test day. Many italki teachers (including myself) provide TOEFL preparation — you can search for that on the “find a teacher page”. By the way, a quick look at your profile shows you’ve already taken lessons with some italki teachers, and (based on my special ability to understand teacher profiles) it looks like your latest one is really good. What exactly are you looking for in a teacher?