diff --git a/classes/local/db/moodle_core_repository.php b/classes/local/db/moodle_core_repository.php
index 63e4d1a..331e149 100644
--- a/classes/local/db/moodle_core_repository.php
+++ b/classes/local/db/moodle_core_repository.php
@@ -19,4 +19,32 @@ public function get_role_id_by_shortname(string $shortname): int|false {
     public function get_user_id_by_username(string $username): int|false {
         return (int)$this->db->get_field('user', 'id', array('username' => $username));
     }
+
+
+    /**
+     * @param string $module name of the module
+     * @param int $instance_id instance id of the module
+     * @throws dml_exception if the record does not exist
+     */
+    public function get_grade_item(string $module, int $instance_id): object {
+        return $this->db->get_record('grade_items', array('iteminstance' => $instance_id, 'itemmodule' => $module), '*', MUST_EXIST);
+    }
+
+    /**
+     * @param int $grade_item_id
+     * @param array $data
+     * @throws dml_exception if the record does not exist
+     */
+    public function update_grade_item_record(int $grade_item_id, array $data): void {
+        $this->db->update_record('grade_items', (object)array_merge($data, ['id' => $grade_item_id]));
+    }
+
+    /**
+     * @param int $cmid
+     * @param array $data
+     * @throws dml_exception if the record does not exist
+     */
+    public function update_course_module_record(int $cmid, array $data): void {
+        $this->db->update_record('course_modules', (object)array_merge($data, ['id' => $cmid]));
+    }
 }
\ No newline at end of file
diff --git a/tests/local/db/moodle_core_repository_test.php b/tests/local/db/moodle_core_repository_test.php
index 17e07c4..495a78c 100644
--- a/tests/local/db/moodle_core_repository_test.php
+++ b/tests/local/db/moodle_core_repository_test.php
@@ -4,6 +4,7 @@
 
 global $CFG;
 
+use dml_exception;
 use local_adler\lib\adler_testcase;
 use local_adler\local\db\moodle_core_repository;
 
@@ -41,4 +42,68 @@ public function test_get_user_id_by_username() {
 
         $this->assertEquals(false, $result);
     }
+
+    public function provide_true_false_data() {
+        return [
+            'true' => [true],
+            'false' => [false]
+        ];
+    }
+
+    /**
+     * @dataProvider provide_true_false_data
+     */
+    public function test_get_grade_item($exists) {
+        $moodle_core_repository = new moodle_core_repository();
+
+        if ($exists) {
+            // create grade_item
+            $course = $this->getDataGenerator()->create_course();
+            $grade_item = $this->getDataGenerator()->create_grade_item(['courseid' => $course->id, 'itemmodule' => 'url', 'iteminstance' => 1]);
+
+            // call function
+            $result = $moodle_core_repository->get_grade_item($grade_item->itemmodule, $grade_item->iteminstance);
+
+            // check result
+            $this->assertEquals($grade_item->id, $result->id);
+        } else {
+            // error case
+            $this->expectException(dml_exception::class);
+
+            // call function
+            $moodle_core_repository->get_grade_item('url', 1);
+        }
+    }
+
+    public function test_update_grade_item_record() {
+        global $DB;
+        $moodle_core_repository = new moodle_core_repository();
+
+        // create grade_item
+        $course = $this->getDataGenerator()->create_course();
+        $grade_item = $this->getDataGenerator()->create_grade_item(['courseid' => $course->id, 'itemmodule' => 'url', 'iteminstance' => 1]);
+
+        // call function
+        $moodle_core_repository->update_grade_item_record($grade_item->id, ['gradepass' => 100]);
+
+        // check result
+        $result = $DB->get_record('grade_items', ['id' => $grade_item->id]);
+        $this->assertEquals(100, $result->gradepass);
+    }
+
+    public function test_update_course_module_record() {
+        global $DB;
+        $moodle_core_repository = new moodle_core_repository();
+
+        // create course_module
+        $course = $this->getDataGenerator()->create_course();
+        $course_module = $this->getDataGenerator()->create_module('url', ['course' => $course->id]);
+
+        // call function
+        $moodle_core_repository->update_course_module_record($course_module->cmid, ['completion' => 2]);
+
+        // check result
+        $result = $DB->get_record('course_modules', ['id' => $course_module->cmid]);
+        $this->assertEquals(2, $result->completion);
+    }
 }
\ No newline at end of file