1.  Go to WP Admin -> plugins -> editor - >Wplms customiser -> wplms-customizer.php


  

add_filter('wplms_curriculum_course_link','enable_course_students_view_units_curriculum');
 

function enable_course_students_view_units_curriculum($enable){
 
$user_id = get_current_user_id();
$course_id = get_the_ID();
 
if(wplms_user_course_active_check($user_id,$course_id))
return 1;
 
return $enable;
}

add_filter('wplms_direct_access_tounit','enable_access_tostudents',10,2);
function enable_access_tostudents($flag,$post){
    $user_id = get_current_user_id();
    $check = get_user_meta($user_id,$post->ID,true);
    if(!empty($check)){
        return 0;
    }
   return $flag;
}