A

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

int main() {
    int t;
    cin>>t;
    while(t--)
    {
        int N,M;
        long long sum=0;
        cin>>N>>M;
        vector<int> batsman(N);
        vector<int> bowler(M);
        for(int i=0;i<N;i++)
        {
            cin>>batsman[i];
        }
        for(int i=0;i<M;i++){
            cin>>bowler[i];
        }
        if(N<4 || M<4 || (N+M)<11)
        {
            cout<<"-1"<<endl;
            continue;
        }

        sort(batsman.rbegin(),batsman.rend());
        sort(bowler.rbegin(),bowler.rend());

        for(int i=0;i<4;i++)
        {
            sum+=batsman[i];
            sum+=bowler[i];
        }
        int count=0,i=4,j=4;
        while(count<3)
        {
            if(i<N && j<M)
            {
                if(batsman[i]>bowler[j])
                {
                    sum+=batsman[i];
                    i++;
                }
                else
                {
                    sum+=bowler[j];
                    j++;
                }
            }
            else if(i<N)
            {
                sum+=batsman[i];
                i++;
            }
            else{
                sum+=bowler[j];
                j++;
            }
            count++;
        }
        cout<<sum<<endl;
    }
}