#include<bits/stdc++.h>

using namespace std;

int main() {
	int t;
	cin>>t;	
	for(int i=1;i<=t;i++){
		int n,m;
		cin>>n>>m;
		for(int i=1;i<=n-1;i++){
			int a,b;
			cin>>a>>b;
		}
		if(n%m==0) cout<<"YES"<<endl;
		else cout<<"NO"<<endl;
	}
	return 0;
}