#include <bits/stdc++.h>
using namespace std;

using ll = long long;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int T;
    cin >> T;

    while (T--) {
        int N;
        ll K;
        cin >> N >> K;

        vector<ll> A(N), B(N), C(N), D(N);
        for (int i = 0; i < N; i++) cin >> A[i];
        for (int i = 0; i < N; i++) cin >> B[i];
        for (int i = 0; i < N; i++) cin >> C[i];
        for (int i = 0; i < N; i++) cin >> D[i];

        multiset<ll> buys;
        ll gold = 0;

        for (int i = 0; i < N; i++) {

            // Add buys
            for (ll j = 0; j < B[i]; j++) {
                buys.insert(A[i]);
                if ((ll)buys.size() > K) {
                    auto it = prev(buys.end());
                    buys.erase(it);
                }
            }

            // Sell
            ll can_sell = min((ll)buys.size(), D[i]);

            while (can_sell--) {
                auto it = buys.begin();
                ll cost = *it;
                buys.erase(it);
                gold += (C[i] - cost);
            }
        }

        cout << gold << '\n';
    }
}