Hi All,
my test class for batch apex is not covering the complete code,could you pls help me for complete coverage.
Here is my batch class

 global with sharing class batchHandler implements Database.Batchable<SObject> {
 global Database.QueryLocator start(Database.BatchableContext bc){
      String squery = 'SELECT Id,Referral_Stage__c,Account_Type__c,(SELECT Id,createdDate from child1__r ORDER BY CreatedDate DESC LIMIT 50),(SELECT Id,createdDate from child2__r  ORDER BY CreatedDate DESC LIMIT 50),(SELECT Id,createdDate from child3__r ORDER BY CreatedDate DESC LIMIT 50),(SELECT Id,createdDate from child4__r ORDER BY CreatedDate DESC LIMIT 50) from Account';
      return Database.getQueryLocator(squery);
  }
  global void execute(Database.BatchableContext bc,List<Account> scope){
    Date today = Date.today();
    Date twoMonthsBefore = today.addDays(-10);
    Set<Account> accounts = new Set<Account>();
    List<Account> accToUpdate = new List<Account>();
    // Map<id,Account> accMap=new Map<id,Account>();
    //if(scope.size()>0){
  for(Account acc:scope){
      try{
         if(!acc.child1__r .isEmpty()){
        for(Referral__c insurance:acc.child1__r ){
       // if(insurance.size()>0){
            if(insurance.createdDate > twoMonthsBefore){
            acc.Referral_Stage__c='Currently Referring';
            accounts.add(acc);
            //  accMap.put(acc.Id,acc);
           } else if(insurance.createdDate < twoMonthsBefore){
              acc.Referral_Stage__c='Referred Inactive';
              accounts.add(acc);
              //  accMap.put(acc.Id,acc);
           }
       //  }
           } 
         }else if(!acc.child2__r .isEmpty()){
             for(Referral__c mso:acc.child2__r ){
        if(mso.createdDate > twoMonthsBefore){
          acc.Referral_Stage__c='Currently Referring';
          accounts.add(acc);
          //  accMap.put(acc.Id,acc);
      }else if(mso.createdDate < twoMonthsBefore){
        acc.Referral_Stage__c='Referred Inactive';
        accounts.add(acc);
        //  accMap.put(acc.Id,acc);
       }
     }
      }else if(!acc.child3__r .isEmpty()){
          for(Referral__c ipa:acc.child3__r ){
        if(ipa.createdDate > twoMonthsBefore){
          acc.Referral_Stage__c='Currently Referring';
          accounts.add(acc);
          //  accMap.put(acc.Id,acc);
      }else if(ipa.createdDate < twoMonthsBefore){
        acc.Referral_Stage__c='Referred Inactive';
        accounts.add(acc);
        //  accMap.put(acc.Id,acc);
          }         
       }
      }else if(!acc.child4__r .isEmpty()){
          for(Referral__c pcp:acc.child4__r ){
        if(pcp.createdDate > twoMonthsBefore){
          acc.Referral_Stage__c='Currently Referring';
          accounts.add(acc);
          //  accMap.put(acc.Id,acc);
      }else if(pcp.createdDate < twoMonthsBefore){
        acc.Referral_Stage__c='Referred Inactive';
        accounts.add(acc);
        //  accMap.put(acc.Id,acc);
       }
      }
    }
      else{
          acc.Referral_Stage__c='Never Referred';
          accounts.add(acc);
          //  accMap.put(acc.Id,acc);
        }
      }catch(Exception e){
        }
      }
    
 // }
    if(!accounts.isEmpty()){
        //update accounts;
        accToUpdate.addAll(accounts);
    } 
      if(!accToUpdate.isEmpty()){
           update accToUpdate;
      }
      /*  if(accMap!=null){
            accToUpdate=accMap.values();
            //update accMap.values();
        }
        if(!accToUpdate.isEmpty()){
            update accToUpdate;
        } */ 
  }
  global void finish(Database.BatchableContext bc){
  }
}

My Test class is : 
 @isTest
private class batchHandlerTest {
    static testmethod void testBatch() {
         List<Account> acclist = new List<Account>();
         for(Integer i=0;i<200;i++){
           //  try{
             Account acc=new Account();
             acc.Name = 'Account'+i;
             acc.Account_Type__c = 'IPA';
             acc.Phone = '1234567890';
             acc.Referral_Stage__c = 'Never Referred';
             acclist.add(acc);
        // }catch(Exception e){}
            
           
        }
         insert acclist;
         Test.startTest();
           batchHandler b = new batchHandler();
           Database.executeBatch(b);
         Test.stopTest();
         Account[] updateRefStage = [select id,name,Referral_Stage__c from Account];
         system.assert(updateRefStage[0].Referral_Stage__c.contains('Never Referred'));
    }
}

This giving only 50% of coverage and If --- else if -- conditions are not covered.