| Value | 
                    Category | 
                                                                            
                                    
                    
                        | The basic from primary school is not hight enough especially mathematic subject | 
                          | 
                        
                            
                        
                        
                        
                        
                            
                    
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.