Having a student teacher (or a helping hand) can definitely help figure out that situation.
I know first hand what it's like to be able to just sit down, one on one, with a child who's struggling.
It might be with math facts, or reading, or writing. It doesn't matter WHAT they're struggling with, you know it when you see that look on their face, or their body language telling you that they need… HELP!!!!!
So, when a student teacher arrives, it's a great opportunity for me to sit back and observe how the classroom is run, who needs extra help, who is in control (or who has too much control), who seems to be just "sliding by"… and then I try to think of creative ways to help those situations.
For instance, I have 4 students that are just struggling with reading. Research has shown that if you don't know your "sight words", it is a direct correlation of not being a proficient reader at your grade level (especially at the younger grades). Therefore, I came up with this "friendly competition" with those 4 students where I personally "drafted" 2 of them to be on my team, and my student teacher "drafted" 2 of them to be on her team.
My team lost the first round (by about 10 words total), but it's given them the energy to practice the words they missed, AND to start figuring out the next 100 words… on their own… before the next "challenge round."
All in all, it's a great way to get them reading a little more fluently, and to have a little more success, and ultimately, to not have them struggle as much.
Morale of this story: Make sure you use the help that's given to you… whether it be a student teacher, teacher assistant, teacher aide, or parent helper. It's well worth it in the long run!