Georgia tech admission problems

<p>I'm an international applicant for georgia Tech, but I got some problems.
I just can't unterstand the sentence"If you are still completing a
course or plan to take it prior to graduation, place an "X" in the
appropriate semester block to indicate when you will take the course."
Shall I put an X in the grade columns of 12th courses that I am now studying?
or just leave them blank?
In addition, what's the meaning of class in your school system? The students in one classroom or in all the grade?
because i don't know how to put "Number of students in your senior class"
whether I should put 50(a class) or 610(the total of all class in my grade)?</p>

<ol>
<li>you should put the x next to your senior year courses.</li>
<li>your class means your entire grade so put down 610.</li>
</ol>

<p>my friend applied to GTech btw.</p>

<p>put the x next to your senior year courses? put it near the title or in the grade column?</p>

<p>in the grade column</p>