#include<bits/stdc++.h>
#define endl '\n'
using namespace std;
void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}
const int maxn=1e3+2;
int t,n,h,l[maxn],r[maxn];
void solve()
{
    cin>>t;
    for(int z=1;z<=t;z++)
    {
        cin>>n>>h;
        int sumh=0;
        for(int i=1;i<=n;i++)
        {
            cin>>l[i]>>r[i];
            sumh+=(l[i]+r[i])/2;
            //if((l[i]+r[i])%2!=0)sumh++;
        }
        if(sumh>=h)
        {
            cout<<"YES"<<"\n";
        }
        else cout<<"NO"<<"\n";
    }
}
int main()
{
    freopen("battle.in","r",stdin);
    freopen("battle.out","w",stdout);
    speed();
    solve();

    return 0;
}