The only "legal" bit would be between landing and taking off at a licenced field.
To be honest it doesn't sound like you're getting particularily good training here, but have a word with your FI first before jumping ship. Though I wouldn't expect much joy from that.
Pre and Post flight briefings are critical for students, this is obviously best backed up by your own reading of the books, but it certainly helps if you know what you are going to do next, or what you did wrong and what you need to read more on before your next lesson.