Weird, I have noticed quite many times the problem with Iruka while trying to do the Exams, he is third in a row after Naruto for example, second is naruto, basically lineup goes like this -
X-X-X
X-Naruto-X
Main-Iruka-Sasuke

The thing is...Iruka buffs shields first, and then Naruto places his clones...why ? wtf... the order is that Sasuke is first, Naruto Second, Iruka third, he should use his buffs ONLY after naruto has done his clones and other standard stuff before action...