Tuck is probably the only school in the top 10 that allows two GMAT scores (I haven't done research on other schools but that is neither here nor there). Do you know how Tuck uses the scores? Are they looking at the breakdowns or do they want an upward progression?
Tuck (and INSEAD) look at the two parts of the GMAT score. Tuck will weight the highest quant and the highest verbal even if the two scores occurred in different sittings. Ideally, Tuck wants to see >80% on the quant and on the verbal.