If Pitt is not too big, you need to apply early in order to be considered for merit. It is not a common app school and the application opens in June. This means doing the application early and getting the guidance counselor to send in the transcripts as soon as school opens in the fall.
Lehigh does give merit to top applicants, however it is very important to show interest as often as possible. If you live near the school you need to visit in person. Attend as many sessions as possible that the school has in your area (Lehigh in your area events). They do give “points” for attending those sessions and they make that very clear. Also- the “Why Lehigh” essay should be very detailed.