I know EXACTLY what you mean, I am retaking Math 105 for the third time this year in college b/c i just can not comprehend it. I know that you can do it, just put your mind to it, and the Lord with help you out as well!
Lord Jesus, I pray for this student, that you would be working through him/her and let him comprehend what is being taught. I know how hard it can be Lord, and I know that you can help him. Just put your arms around him while he is being taught in order for him to take in everything that is being said, and then also to remember it for the tests Lord. In Jesus Christs name I pray AMEN!