feb2

#include <iostream>
using namespace std;

int main() {
  int s_odd,s_even,i,x,k,m,n,t,done;
  char s[1]; 
  
  cin>>t;
  while(t--)
  {
    cin>>n>>m>>x>>k;
    s_even = 0;
    s_odd = 0;
    
    for(i=0;i<k;i++)
    {
      cin>>s[0];
      if(s[0]=='E')
        s_even += 1;
      else
        s_odd += 1;
    }
    
    done = 0;
    for(i=1;i<=m;i++)
    {
      if(i%2==1)
      {
        if(x>=s_odd)
        {
          done = done + s_odd;
          s_odd = 0;
        }
        else
        {
          s_odd = s_odd - x;
          done = done + x;
        }
      }
      else
      {
        if(x>=s_even)
        {
          done = done + s_even;
          s_even = 0;
        }
        else
        {
          s_even = s_even -x;
          done = done + x;
        }
      }
      if(n<=done)
        break;
    }
    
    if(n<=done)
      cout<<"yes"<<endl;
    else
      cout<<"no"<<endl;
    
  }
}