private function getType($type)
 {
     if ($type == 'LEC') {
         return CourseType::where('name', 'Lecture')->first();
     } else {
         if ($type == 'TUT') {
             return CourseType::where('name', 'Tutorial')->first();
         } else {
             if ($type == 'LAB') {
                 return CourseType::where('name', 'Lab')->first();
             } else {
                 return CourseType::firstOrCreate(['name' => $type]);
             }
         }
     }
 }