Is this is the correct way to implement composition, association and aggregation?

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Java

<pre lang="java">

package aggregationlatest;

public class AggregationLATEST {

    public static void main(String[] args) {

        Student student1=new Student("JOHN SNOW",88,1);
        School s1= new School("XYZ","Torronto",12,1000,student1);
        Bus b1=new Bus("CA 1101","START","END",50,200);      

        s1.createClass();
        s1.display();
        student1.busDetail(b1);


        }

}

class School
{
String name;
String address;
int maxClass;
int strength;
Class c1;
Student s1;                                    //school have student Aggregation

School(String name,String address,int maxClass,int strength,Student first)
{
this.name=name;
this.address=address;
this.maxClass=maxClass;
this.strength=strength;
s1=first;
}
        class Class                            //since class is dependend on school hence composition 
       {
           String name;
           int Boysstrength;
           int girlsStrength;
           String classTeacher;

           Class(String name,int Boysstrength,int girlsStrength,String classTeacher)
            {
           this.name=name;
           this.Boysstrength=Boysstrength;
           this.girlsStrength=girlsStrength;
           this.classTeacher=classTeacher;
           }

           void totalStrength()
           {
               System.out.println("total strengthis " + (Boysstrength + girlsStrength));
           }

        }


           void createClass()
           {
           c1=new Class("1st",12,12,"CERSI LANISTER");  //can be mltiple object 

           }

           void display()
           {

           System.out.println(name+" "+address+" "+maxClass+" "+strength);
           System.out.println(c1.name+" "+c1.Boysstrength+" "+c1.girlsStrength+" "+c1.classTeacher);
           System.out.println(s1.name+" "+s1.lastPERCENTAGE+" "+s1.rollNo);
           c1.totalStrength();
           }
}



class Student
{

    String name;
    int lastPERCENTAGE;
    int rollNo;
    Student(String name,int lastPERCENTAGE,int rollNo)
    {
    this.name=name;
    this.lastPERCENTAGE=lastPERCENTAGE;
    this.rollNo=rollNo;

    }

    void busDetail(Bus b1)                        //student uses bus (association)
    { 

        System.out.println(b1.busLicencePlate+" "+b1.endPoint+" "+b1.maxStrength+" "+b1.monthlyCharge);

    }

}


class Bus
{
    String busLicencePlate;
    String startingPoint;
    String endPoint;
    int maxStrength;
    int monthlyCharge;

    Bus(String busLicencePlate,String startingPoint,String endPoint,int maxStrength,int monthlyCharge)
    {
    this.busLicencePlate=busLicencePlate;
    this.startingPoint=startingPoint;
    this.endPoint=endPoint;
    this.maxStrength=maxStrength;
    this.monthlyCharge=monthlyCharge;        

    }

}

What I have tried:

I have tried to implement aggregation, association and composition .Look at the comment to see which is where .

Question
1.Is this class model wright?
2.Is the implementation is wright?
3.what will be your suggestion to improvement this code ?