diff --git a/judger.c b/judger.c
index e3a5933..8e8e2b2 100644
--- a/judger.c
+++ b/judger.c
@@ -112,7 +112,7 @@ static PyObject *judger_run(PyObject *self, PyObject *args, PyObject *kwargs) {
     }
 
     if(config.use_nobody && getuid() != 0) {
-        PyErr_SetString(PyExc_ValueError, "root use is required when using nobody");
+        PyErr_SetString(PyExc_ValueError, "root user is required when using nobody");
         return NULL;
     }
 
diff --git a/tests/12/12/12/Main.c b/tests/12/12/12/Main.c
deleted file mode 100644
index 90449db..0000000
--- a/tests/12/12/12/Main.c
+++ /dev/null
@@ -1,15 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-int main()
-{
-    // 150m
-    int big_size = 150 * 1024 * 1024;
-
-    int *b = NULL;
-
-    b = (int *)malloc(big_size);
-    memset(b, 0, big_size);
-    return 0;
-}
diff --git a/tests/12/12/12/config b/tests/12/12/12/config
deleted file mode 100644
index 474ea7b..0000000
--- a/tests/12/12/12/config
+++ /dev/null
@@ -1 +0,0 @@
-{"language": "c", "max_cpu_time": 300, "max_memory": 100000000}
diff --git a/tests/12/12/12/out b/tests/12/12/12/out
deleted file mode 100644
index e69de29..0000000
diff --git a/tests/12/12/12/result b/tests/12/12/12/result
deleted file mode 100644
index 2ce151d..0000000
--- a/tests/12/12/12/result
+++ /dev/null
@@ -1 +0,0 @@
-{"flag": 3, "signal": 0}
diff --git a/tests/12/12/Main.c b/tests/12/12/Main.c
deleted file mode 100644
index 90449db..0000000
--- a/tests/12/12/Main.c
+++ /dev/null
@@ -1,15 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-int main()
-{
-    // 150m
-    int big_size = 150 * 1024 * 1024;
-
-    int *b = NULL;
-
-    b = (int *)malloc(big_size);
-    memset(b, 0, big_size);
-    return 0;
-}
diff --git a/tests/12/12/config b/tests/12/12/config
deleted file mode 100644
index 474ea7b..0000000
--- a/tests/12/12/config
+++ /dev/null
@@ -1 +0,0 @@
-{"language": "c", "max_cpu_time": 300, "max_memory": 100000000}
diff --git a/tests/12/12/out b/tests/12/12/out
deleted file mode 100644
index e69de29..0000000
diff --git a/tests/12/12/result b/tests/12/12/result
deleted file mode 100644
index 2ce151d..0000000
--- a/tests/12/12/result
+++ /dev/null
@@ -1 +0,0 @@
-{"flag": 3, "signal": 0}