i was able to display values to the picklist using this code:

VF PAGE:
<apex:column headerValue="Year/Block">
    <apex:selectList size="1" value="{!course.Year_Block__c}">
        <apex:selectOptions value="{!statusOptions}"/>
    </apex:selectList>
</apex:column>
Apex Class:
    public Student__c student {get;set;}
    public Course__c course {get;set;}
    
    public List<StudentWrapper> wrappers {get; set;}
    public List<CourseWrapper> wrapperc {get;set;}
    public List<SelectOption> statusOptions {get;set;}

    public NewStudentEntryCX(ApexPages.StandardController controller) {
        //other codes

        statusOptions = new List<SelectOption>();
        Schema.DescribeFieldResult statusFieldDescription = Course__c.Year_Block__c.getDescribe();
        Course__c var = [Select Id, Year_Block__c from Course__c where Id = : Apexpages.currentPage().getParameters().get('id')];
        for(String s: var.Year_block__c.split(';'))
        statusOptions.add(new SelectOption(s, s));   
    }
    
    public PageReference save() {
          List<Student__c> studentList = new List<Student__c>();
          for (StudentWrapper wrap : wrappers) {
              Student__c student = new Student__c();
              student.Full_Name__c = wrap.studentwrap.Full_Name__c;
              student.Email__c = wrap.studentwrap.Email__c ;
              student.Gender__c = wrap.studentwrap.Gender__c ;
              student.Course__c = getCourseList().id;
              student.Year_Block__c = **-should be the selectOption value-**
              studentList.add(student);
          }
          
          insert studentList;
  
          PageReference p = new PageReference('/apex/Main');
          return p;
    }

 my problem is how can i get the value of the picklist/selectOptions to save?

help please.