Urdu (as well as Pashto and Punjabi) has too many unneccesary alphabet letters, we should keep only one letter for every sound and discard the rest, e.g. Alif for the whole A group, Te for the T group...
A
ا (Alif) - ع(Ain) - ء (Hamzah)
T
ت (Te) - ط (To'e)
H
ح (Barri He) - ہ, ﮩ, ﮨ (Choti He) ھ (Do Chashmi He)
Z
ذ (Zaal) - ز (Ze) - ض (Zu'ad) - ظ (Zo'e)
S
س (Seen) - ص (Su'ad)
K
ق (Kaaf) - ک (Kaaf)