function boardCutting(cost_y, cost_x) {
    // Write your code here
    let sum =BigInt(0);
    let sortedCostX = [...cost_x].toSorted((a,b) => b-a);
    let sortedCostY = [...cost_y].toSorted((a,b) => b-a);
    let px = 0, py = 0;
    while(px < sortedCostX.length && py < sortedCostY.length) {
        if(sortedCostX[px] > sortedCostY[py]) {
            sum += BigInt(py+1) * BigInt(sortedCostX[px]);
            px++;
        } else {
            sum += BigInt(px+1) * BigInt(sortedCostY[py]);
            py++;           
        }
    }
    while(px < sortedCostX.length) {
        sum += BigInt(py+1) * BigInt(sortedCostX[px]);
        px++;
    }    
    while(py < sortedCostY.length) {
        sum += BigInt(px+1) * BigInt(sortedCostY[py]);
        py++;
    }
    return sum % BigInt(10**9+7);
}

1
2 2
2
1

1
6 4
2 1 3 1 4
4 1 2

def boardCutting(cost_y, cost_x):
    MOD = 10**9 + 7
    
    # Sort costs in descending order
    cost_y.sort(reverse=True)
    cost_x.sort(reverse=True)
    
    # Variables to track the number of segments
    horizontal_segments = 1
    vertical_segments = 1
    
    total_cost = 0
    
    i, j = 0, 0
    while i < len(cost_y) and j < len(cost_x):
        if cost_y[i] >= cost_x[j]:
            total_cost += cost_y[i] * vertical_segments
            horizontal_segments += 1
            i += 1
        else:
            total_cost += cost_x[j] * horizontal_segments
            vertical_segments += 1
            j += 1
        total_cost %= MOD
    
    # If there are remaining horizontal cuts
    while i < len(cost_y):
        total_cost += cost_y[i] * vertical_segments
        horizontal_segments += 1
        i += 1
        total_cost %= MOD
    
    # If there are remaining vertical cuts
    while j < len(cost_x):
        total_cost += cost_x[j] * horizontal_segments
        vertical_segments += 1
        j += 1
        total_cost %= MOD
    
    return total_cost

#!/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)