Hi,

Try the below code snippet as reference

global class LeadService {

   webservice String area;

   webservice String region;

   //Define an object in apex that is exposed in apex web service

   global class LeadObject {

      webservice String fname;

      webservice String lname;

      webservice String email;

      webservice String phone;

      webservice String city;

      webservice String state;

      webservice String preference;

      webservice String leadId;

   }

   webservice static LeadObject createLead(LeadObject vLead,Travel_History__c THY,Academic_Profiles__c APS,Work_Experience__c WES) {

       Travel_History__c TH = new Travel_History__c();

       Academic_Profiles__c AP = new Academic_Profiles__c();

       Work_Experience__c WE = new Work_Experience__c();

       Lead lead = new Lead();

       lead.FirstName = vLead.fname;

       lead.LastName = vLead.lname;

       lead.Email = vLead.email;

       lead.Phone = vLead.phone;

       lead.City = vLead.city;

       lead.State = vLead.state;

       lead.Description = vLead.preference;

       lead.Company = 'None';

       insert lead;

       TH.Lead__c = Lead.id;

       TH.Name = 'Country';

       Insert TH;

       AP.Lead__c= Lead.id;

       Insert AP;

       WE.Lead__c= Lead.id;

       WE.Work_Experience_details__c = 'Self';

       WE.name= 'Company';

    //   WE.Work_Experience_End_Date_MM_YYYY__c = '02/2012';

    //   WE.Work_Experience_Start_Date__c = '02/2012';

       Insert WE;

       vLead.leadId = lead.id;

       return vLead;

  }

  webservice static LeadObject getLead(string leadId) {

      Lead l = [SELECT id, FirstName, LastName, Email, Phone, City, State, Description FROM Lead WHERE id = :leadId];

       LeadObject vLead = new LeadObject();

       vLead.fname = l.FirstName;

       vLead.lname= l.LastName;

       vLead.email= l.Email;

       vLead.phone = l.Phone;

       vLead.city = l.City ;

       vLead.state = l.State;

       vLead.preference = l.Description;

       vLead.leadId = l.id;

      return vLead;

  }

  webservice static LeadObject getLeadByEmailId(string emailId) {

      Lead l = [SELECT id, FirstName, LastName, Email, Phone, City, State, Description FROM Lead WHERE Email = :emailId];

       LeadObject vLead = new LeadObject();

       vLead.fname = l.FirstName;

       vLead.lname= l.LastName;

       vLead.email= l.Email;

       vLead.phone = l.Phone;

       vLead.city = l.City ;

       vLead.state = l.State;

       vLead.preference = l.Description;

       vLead.leadId = l.id;

      return vLead;

  } 

  webservice static void updateLead(LeadObject vLead) {

       String leadId = vLead.leadId;

       Lead lead = [SELECT id, FirstName, LastName, Email, Phone, City, State, Description FROM Lead WHERE id = :leadId];

       lead.FirstName = vLead.fname;

       lead.LastName = vLead.lname;

       lead.Email = vLead.email;

       lead.Phone = vLead.phone;

       lead.City = vLead.city;

       lead.State = vLead.state;

       lead.Description = vLead.preference;

       update lead;

  }

  testMethod static void testWebSrvceAddNumbers()

{

    LeadService w= new LeadService ();

    LeadObject lo=new LeadObject();

    lo.fname='fn';

    lo.lname='ln';

    lo.email='aj@email.com';

    lo.phone='9999999999';

    lo.city='Noida';

    lo.state='up';

    Travel_History__c th=new Travel_History__c();

    Academic_Profiles__c ap=new Academic_Profiles__c();

    Work_Experience__c we=new Work_Experience__c();

    LeadService.createLead(lo,th,ap,we);

    Lead ld=new Lead(LAstname='ln',Company='com');

    insert ld;

    LeadService.getLead(ld.id);

    LeadService.getLeadByEmailId('aj@email.com');

}

}

Did this answer your question? If not, let me know what didn't work, or if so, please mark it solved.