# include <bits/stdc++.h>
using namespace std;
const int MAXN = 1e6;
void solve()
{
    long long n,h;
    cin>> n >> h;
    long long SUML = 0, SUMR = 0;
    long long i,j,l,r;
    for(i = 1;i<=n;i++)
    {
        cin>>l>>r;
        SUML+=l;
        SUMR+=r;
    }
    if(h<=SUML)
    {
        cout<<"YES"<<endl;
        return ;
    }
    if(h>SUMR)
    {
        cout<<"NO"<<endl;
        return ;
    }
    if(SUMR - h+1 >= h - SUML)
    {
        cout<<"YES"<<endl;
    }
    else
        cout<<"NO"<<endl;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    freopen ("battle.in","r",stdin);  freopen ("battle.out","w",stdout);
    int t;
    cin>>t;
    while(t--)
        solve();
}