#include<bits/stdc++.h>
#define int long long
using namespace std;
int t, h, n, av, a, b;
signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    freopen("battle.in", "r", stdin);
    freopen("battle.out", "w", stdout);
    cin>>t;
    while(t --)
    {
        cin>>n>>h;
        av = 0;
        for(int i = 0; i < n; i ++)
        {
            cin>>a>>b;
            av += (a + b);
        }
        h *= 2;
        //cout<<av<<" "<<h<<endl;
        if(av - h >= -1) cout<<"YES\n";
        else cout<<"NO\n";
    }
    return 0;
}