/* 
 * File:   lelemon.cpp
 * Author: Ayush
 *
 * Created on December 21, 2014, 10:36 PM
 */
 
#include<iostream>
 
using namespace std;
 
long long arr[102][102], room[10001];
 
int main(int argc, char** argv)
{
    long long n, m, t;
    cin>>t;
    while (t--)
    {
        long long ans = 0, row=0, c=0,max=0,col=0,i,j,visit[10000]={0};
        cin >> n>>m;
        for (i = 0; i < m; i++)
            cin >> room[i];
        for (i = 0; i < n; i++)
        {
            cin >>arr[i][101];
            for (j = 0; j < arr[i][101]; j++)
                cin >> arr[i][j];
        }
        for (i = 0; i < m; i++)
        {
            row = room[i];
            c = arr[row][101];
            if(visit[i]==c)
                continue;
            visit[i]++;          
            max=arr[row][0];
            for(j=1;j<c;j++)
            {
                if(arr[row][j]>=max)
                {                 
                    max=arr[row][j];
                    col=j;
                }
            }
            arr[row][col]=0;
            ans += max;
        }
        cout << ans << "\n";
    }
    return 0;
}
 
 

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