There is room to seat 12 (or more) tables on the very last level. Wait for the line to fill completely up and fill up all of the hearts at the podium. Don't worry about color matching or snacks. Seat the first 6 and go back to the podium for 1 heart. Take orders and serve them. Wait at the podium for one heart. Give out the checks but DO NOT CLEAR the DISHES. Return to the podium and fill up all of the hearts and seat 6 more and repeat the above steps. When 12 tables have empty dishes, clear the tables for a 12x multiplier. Continue to seat 6, seat 6, clear 12 pattern until the line is completely empty. I lost 2 tables and still overshot expert using this method.
This method can be used on a lot of the advanced levels, just adjust for the amount of tables given