#!/bin/python3

import math
import os
import random
import re
import sys

#
# Complete the 'boardCutting' function below.
#
# The function is expected to return an INTEGER.
# The function accepts following parameters:
#  1. INTEGER_ARRAY cost_y
#  2. INTEGER_ARRAY cost_x
#

def boardCutting(cost_y, cost_x):
    MOD = 10**9 + 7
    
    # Combine the cost arrays and sort them
    all_costs = sorted([(cost, 'h') for cost in cost_y] + [(cost, 'v') for cost in cost_x], reverse=True)
    
    # Initialize variables
    horizontal_segments = 1
    vertical_segments = 1
    total_cost = 0
    
    # Process each cut in sorted order
    for cost, cut_type in all_costs:
        if cut_type == 'h':
            total_cost = (total_cost + cost * vertical_segments) % MOD
            horizontal_segments += 1
        elif cut_type == 'v':
            total_cost = (total_cost + cost * horizontal_segments) % MOD
            vertical_segments += 1
    
    return total_cost

if __name__ == '__main__':

    q = int(input().strip())

    for q_itr in range(q):
        first_multiple_input = input().rstrip().split()

        m = int(first_multiple_input[0])

        n = int(first_multiple_input[1])

        cost_y = list(map(int, input().rstrip().split()))

        cost_x = list(map(int, input().rstrip().split()))

        result = boardCutting(cost_y, cost_x)
        print(result)