Something like:
mainlist = [([[212, 26], [314, 26], [314, 50], [212, 50]], 'SCB MEDICAL', 0.998906268787747), ([[36, 56], [84, 56], [84, 80], [36, 80]], '6ein8', 0.19502338570146513), ([[303, 99], [335, 99], [335, 119], [303, 119]], 'OPD', 0.9985000298670181), ([[23, 119], [59, 119], [59, 135], [23, 135]], 'CR No', 0.996245605687589), ([[55, 105], [182, 105], [182, 134], [55, 134]], '211022203481161', 0.9774761960967909), ([[373, 129], [395, 129], [395, 141], [373, 141]], 'Sal', 0.3229167512055152), ([[401, 123], [461, 123], [461, 141], [401, 141]], '29 years/M', 0.760099694251474)]
for thetuple in mainlist:
for x in range(len(thetuple)):
if thetuple[x] == 'CR No':
print(thetuple[x], thetuple[x+ 1])