case_count = int(input())
for case_id in range(1, case_count + 1):
mango_count, max_eat = map(int, input().split())
can_eat = True
mangos = list(map(int, input().split()))
mango_sum = sum(mangos)
mangos_eat = list(map(int, input().split()))
for current_mango, current_eat in zip(mangos, mangos_eat):
if current_eat < current_mango:
can_eat = False
if mango_sum > max_eat:
can_eat = False
if can_eat:
print(f"Case {case_id}: Yes")
else:
print(f"Case {case_id}: No")