#include "testlib.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int MAX_T = 200'000;
const int MIN_N = 3;
const int MAX_N = 1'000'000'000;
const int MAX_M = 200'000;

int main(int argc, char* argv[]) {
    registerValidation(argc, argv);
    int T = inf.readInt(1, MAX_T, "T");
    int smM = 0;
    inf.readEoln();
    while(T--)
    {
        int N = inf.readInt(MIN_N, MAX_N, "N");
        inf.readSpace();
        int M = inf.readInt(1, min(MAX_M, N), "M");
        smM += M;
        inf.readEoln();
        vector<int> A(M), B(M);
        int bfA = 0;
        for(int i = 0; i < M; i++)
        {
            A[i] = inf.readInt(1, N, "A_"+to_string(i));
            inf.readSpace();
            B[i] = inf.readInt(1, N, "B_"+to_string(i));
            inf.readEoln();
            inf.ensuref(bfA < A[i], "invalid A");
            bfA = A[i];
        }
        inf.ensuref(reduce(B.begin(), B.end()) == N, "invalid B");
        for(auto& a : A) a--;
        vector<int> sB(M + 1, 0);
        for(int i = 0; i < M; i++) sB[i + 1] = sB[i] + B[i];
        int L = -2*N, R = 2*N;
        for(int i = 0; i < M; i++)
        {
            int l = A[i] - sB[i + 1];
            int r = A[i] - sB[i];
            L = max(l, L);
            R = min(r, R);
        }
        if(L < R) cout << "Yes\n";
        else cout << "No\n";
    }
    inf.readEof();
    inf.ensuref(smM <= MAX_M, "invalid sum M");
}