#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  for (int ti = 0; ti < t; ti++) {
    int n, k;
    cin >> n >> k;
    vector<int> arr(n);
    for (int i = 0; i < n; i++) cin >> arr[i];
    sort(arr.begin(), arr.end());
    vector<int> weights(k);
    for (int i = 0; i < k; i++) cin >> weights[i];
    sort(weights.begin(), weights.end());
    long long total = 0;
    for (int i = n - 1; i >= n - k; i--) {
      total += arr[i];
    }
    int w = 0;
    for (int i = k - 1; i >= 0; i--) {
      if (weights[i] <= 1) break;
      total += arr[w];
      w += weights[i] - 1;
    }
    for (int i = 0; i < k; i++) {
      if (weights[i] > 1) break;
      total += arr[n - 1 - i];
    }
    cout << total << endl;
  }
  return 0;
}
