T = int(input())

for _ in range(T):
    N,M = map(int,input().split())
    arr = []
    for _ in range(M):
        arr.append(tuple(map(int,input().split())))
    
    
    lower = -float("inf")
    upper = float("inf")
    
    x = N
    y = 0

    pre = 0
    for a,b in arr:
        l = (a-pre-b)%N
        u = (a-pre)%N
        
        #print(l, u)
        if l < u:
            lower = max(lower, l)
            upper = min(upper, u)
        else:
            x = min(x, u)
            y = max(y, l)
        
        pre += b
    
    #print(lower, upper)

    if lower < upper and (lower < x or y < upper):
        print("Yes")
    else:
        print("No")