The short answer: These are one-on-one meetings with an instructor—essentially short private-tutoring sessions—to talk about whatever you want to talk about and to help you plan your studies.
But I am not the best person to ask for any more detail than that—exactly how they work, how you schedule them, what the pricing is. Also, the details can be different depending upon which program you're in. I recommend asking someone on our student services team. There's a folder lower down called "Ask Student Services" or you can send an email to
gmat@manhattanprep.com or call 800.576.GMAT (US and Canada).