int[] Math={85,65,40,20};
int[] English={35,55,68,75};
int[] ICT={50,35,69,95};

int i;
int x=1;

int[] marks;

if (x==1) {
       marks=Math;
}
else if (x==2) {
      marks=English;
}
else if (x==3) {
      marks=ICT;
}
for (i=0; i<4; i++ )
{
// check Marks array inside a for loop
}

int[] Math = {85,65,40,20};
    int[] English = {35,55,68,75};
    int[] ICT = {50,35,69,95};

    int i;
    int x=1;

    int[] marks = new int[4];

    if (x==1) {
           marks=Math;
    }
    else if (x==2) {
          marks=English;
    }
    else if (x==3) {
          marks=ICT;
    }

    for (i=0; i<4; i++ )
    {
        System.out.print(marks[i] + " ");
    }