source_code: import java.io.*;
  import java.util.*;
  
  public class A {
      FastScanner in;
      PrintWriter out;
  
      void solve() {
          int tc = in.nextInt();
          for (int t = 0; t < tc; t++) {
              int n = in.nextInt();
              int m = in.nextInt();
              O[] a = new O[n * m];
              int[][] cols = new int[m][n + n];
              for (int i = 0; i < n; i++) {
                  for (int j = 0; j < m; j++) {
                      cols[j][i] = cols[j][i + n] = in.nextInt();
                      a[i * m + j] = new O(i, j, cols[j][i]);
                  }
              }
              Arrays.sort(a);
              boolean[] used = new boolean[m];
              int cntUsed = 0;
              for (O o : a) {
                  if (!used[o.y]) {
                      used[o.y] = true;
                      cntUsed++;
                      if (cntUsed == n) {
                          break;
                      }
                  }
              }
              int[] dp = new int[1 << n];
              int[] ndp = new int[1 << n];
              int[] maxndp = new int[1 << n];
              for (int col = 0; col < m; col++) {
                  if (!used[col]) {
                      continue;
                  }
                  int[] curColumn = cols[col];
                  for (int shift = 0; shift < n; shift++) {
                      System.arraycopy(dp, 0, ndp, 0, ndp.length);
                      for (int mask = 0; mask < 1 << n; mask++) {
                          for (int bit = 0; bit < n; bit++) {
                              if (((1 << bit) & mask) == 0) {
                                  int nmask = mask | (1 << bit);
                                  ndp[nmask] = Math.max(ndp[nmask], ndp[mask] + curColumn[bit + shift]);
                              }
                          }
                      }
                      for (int i = 0; i < ndp.length; i++) {
                          maxndp[i] = Math.max(maxndp[i], ndp[i]);
                      }
                  }
                  int[] tmp = dp;
                  dp = maxndp;
                  maxndp = tmp;
              }
              out.println(dp[dp.length - 1]);
          }
      }
  
      class O implements Comparable<O> {
          int x, y, value;
  
          public O(int x, int y, int value) {
              this.x = x;
              this.y = y;
              this.value = value;
          }
  
          @Override
          public int compareTo(O o) {
              return -Integer.compare(value, o.value);
          }
      }
  
  
      void run() {
          try {
              in = new FastScanner(new File("A.in"));
              out = new PrintWriter(new File("A.out"));
  
              solve();
  
              out.close();
          } catch (FileNotFoundException e) {
              e.printStackTrace();
          }
      }
  
      void runIO() {
  
          in = new FastScanner(System.in);
          out = new PrintWriter(System.out);
  
          solve();
  
          out.close();
      }
  
      class FastScanner {
          BufferedReader br;
          StringTokenizer st;
  
          public FastScanner(File f) {
              try {
                  br = new BufferedReader(new FileReader(f));
              } catch (FileNotFoundException e) {
                  e.printStackTrace();
              }
          }
  
          public FastScanner(InputStream f) {
              br = new BufferedReader(new InputStreamReader(f));
          }
  
          String next() {
              while (st == null || !st.hasMoreTokens()) {
                  String s = null;
                  try {
                      s = br.readLine();
                  } catch (IOException e) {
                      e.printStackTrace();
                  }
                  if (s == null)
                      return null;
                  st = new StringTokenizer(s);
              }
              return st.nextToken();
          }
  
          boolean hasMoreTokens() {
              while (st == null || !st.hasMoreTokens()) {
                  String s = null;
                  try {
                      s = br.readLine();
                  } catch (IOException e) {
                      e.printStackTrace();
                  }
                  if (s == null)
                      return false;
                  st = new StringTokenizer(s);
              }
              return true;
          }
  
          int nextInt() {
              return Integer.parseInt(next());
          }
  
          long nextLong() {
              return Long.parseLong(next());
          }
  
          double nextDouble() {
              return Double.parseDouble(next());
          }
      }
  
      public static void main(String[] args) {
          new A().runIO();
      }
  }
  