import sys


def main():
    input = lambda: sys.stdin.readline()[:-1]
    T = int(input())
    for _ in [0] * T:
        N, M = map(int, input().split())
        A = [M] + list(map(int, input().split()))

        if A[0] < A[1]:
            print("No")
            continue

        a = [0] * (N + 1)
        a[0], a[1] = A[0] - A[1], A[1]
        for i in range(2, N + 1):
            a[i] += a[i - 2]
            a[i - 2] = 0
            if a[i] > A[i]:
                print("No")
                break
            if a[i - 1] + a[i] < A[i]:
                print("No")
                break
            a[i - 1] -= A[i] - a[i]
            a[i] = A[i]
        else:
            print("Yes")


if not __debug__:
    f = open(sys.argv[1], "r")
    sys.stdin = f

main()