#include <bits/stdc++.h>
#define endl '\n'
using namespace std;

void solve()
{
    long long n, h;
    cin >> n >> h;

    vector <pair<int,int>> v(n);
    for (int i = 0; i < n; i++)
        cin >> v[i].first >> v[i].second;

    long long p = 0;
    for (int i = 0; i < n; i++)
    {
        p += (v[i].first + v[i].second) / 2;
    }
    if (p >= h) cout << "YES" << endl;
    else cout << "NO" << endl;
}

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    freopen("battle.in", "r", stdin);
    freopen("battle.out", "w", stdout);

    int t; cin >> t;
    while (t--) solve();

    return 0;
}
/**
3
1 4
4 6
1 5
4 6
1 6
4 6


YES
YES
No
*/