let t = Int(readLine()!)!
for i in 1...t{
    let nm = readLine()!.split(separator: " ").map{Int($0)!}
    let (n,m) = (nm[0],nm[1])
    var A = [0,m] + readLine()!.split(separator: " ").map{Int($0)!}
    
    var f = true
    if n > 1{
    for i in 2...n{
        let a = A[i]-A[i-2]
        if a < 0{
            f = false
        }
        A[i-1] -= a
        if A[i-1] < 0{
            f = false
        }
    }
    }
    if A[n+1] != A[n-1] + A[n]{
        f = false
    }
    if f {
        print("Yes")
    }else{
        print("No")
    }
}