import java.util.*;

import java.io.*;

/*

* @author -- rajatgoyal715

*/

public class CuttingBoards {

public static void main(String[] args) throws IOException {

Scanner sc = new Scanner(System.in);

int t = sc.nextInt();

StringBuilder sb = new StringBuilder("");

while(t--!=0){

int m = sc.nextInt();

int n = sc.nextInt();

long y[] = new long[m-1];

for(int i=0;i<m-1;i++){

y[i] = sc.nextLong();

}

long x[] = new long[n-1];

for(int i=0;i<n-1;i++){

x[i] = sc.nextLong();

}

sb.append(cutBoard(m, n, y, x) + "\n");

}

System.out.println(sb.toString());

}

public static long cutBoard(int m, int n, long[] y, long[] x){

Arrays.sort(y);

Arrays.sort(x);

int horizontal = 1;

int vertical = 1;

int i=m-2;

int j=n-2;

long cost = 0;

long mod = 1000000007;

while(i>=0&&j>=0){

if(y[i]>=x[j]){

cost += vertical*y[i];

i--;

horizontal++;

}

else{

cost += horizontal*x[j];

j--;

vertical++;

}

}

while(j>=0){

cost += horizontal*x[j];

j--;

vertical++;

}

while(i>=0){

cost += vertical*y[i];

i--;

horizontal++;

}

return cost%mod;

}

}