#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("Ofast")

#include <bits/stdc++.h>

#define UINT unsigned int
#define LL long long int
#define ULL unsigned LL
#define LD long double
#define FI first
#define SE second
#define PB push_back
#define PF push_front
#define V vector
#define PQ priority_queue
#define ALL(x) x.begin(), x.end()
#define SZ(x) (int)(x).size()
#define FORI(i, a, b) for(int i = a; i < b ; ++i)
#define FORD(i, a, b) for(int i = a; i > b ; --i)

using namespace std;
using pii = pair<int, int>;

const clock_t START_T = clock();

double time_running(){
    return (double)(clock() - START_T) / CLOCKS_PER_SEC;
}

int main(){
    ifstream cin("battle.in");
    ofstream cout("battle.out");
    mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

    int t, n, h, l, r;
    cin >> t;
    while(t--){
        cin >> n >> h;
        int dmg = 0;
        FORI(_,0,n){
            cin >> l >> r;
            dmg += l + r;
        }
        dmg = dmg / 2 + (dmg % 2);
        cout << (dmg < h ? "NO\n" : "YES\n");
    }

//    cerr << time_running() << endl;
    return 0;
}