Voldemort: Is he after bad grades?

[Michael]

No: HPFGUIDX 80503

I know that the reason Voldemort always appears to Harry at the end 
of the school year in each book is probably for literary reasons.  
It gives the books a climax point.  I noticed that Harry always runs 
into him around exam time.  Though it isn't really that big a deal, 
wouldn't you like to see him have a confrontation maybe over 
Christmas break or earlier in the year?

"Michael"