#include <iostream>
using namespace std;
 
int main() {
	int t; 
	cin >>t;
	while(t--){
		int a,b;
		cin >>a>>b;
		int adm[a][b];
		int dp[a][b];
		for(int i=0;i<a;i++){
			for(int j=0;j<b;j++){
				cin>>adm[i][j];
			}
		}
		for(int i=a-1;i>=0;i--){
			for(int j=b-1;j>=0;j--){
				dp[i][j]=0;
				if(i<a-1)dp[i][j]=max(dp[i][j],dp[i+1][j]);
				if(j<b-1)dp[i][j]=max(dp[i][j],dp[i][j+1]);
				dp[i][j]+=adm[i][j];
			}
		}
		cout<<dp[0][0]<<endl;
	return 0;	
	}
 
}

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