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using namespace std;
int main(){
int test;
cin>>test;
while(test--){
long long int num ,mm;
cin>>num>>mm;
long long bsb[num];
priority_queue <long long int, vector<long long int>, greater<long long int>> ppqq;
for(int i=0;i<num;i++){
cin>>bsb ;
}
long long int b[mm];
for(int i=0;i<mm;i++){
cin>>b ;
}
for(int i=0;i<num;i++){
ppqq.push(bsb );
}
int k = 0 ;
while (k < mm)
{
ppqq.pop();
ppqq.push(b[k]);
k++ ;
}
long long int sum = 0;
while(!ppqq.empty()) {
sum = sum + ppqq.top();
ppqq.pop();
}
cout<<sum<<endl;
}
}