Understanding of math and how it could be used is probably one of the biggest faults that an instructor does while teaching it. If you do not know what or how it can be used you will end up asking yourself why learn it. So if you get it a place in math that you do not understand where it can be used in life ASK!
Asking where it can be used will help increase you concentration toward the particular math subject and help with understanding of math. Another way to increase concentration is just focus on it and it only. No music, no food, no phone, no tv ... And force yourself to sit in one spot and apply yourself to the math. The more you apply yourself the easier it will become and the greater understand you will have. If you get homes work and only 5 questions are given out of ten do the ten after you finish those try write out a few questions of your own and provide an answer for them.
Math is not all +, -, /, * if you get into discrete math you will meet many other symbol and theories. I assure you I was in the same boat as you are but I managed to get off that boat and the sooner you apply yourself to math the easier it will become in the future but without understanding it math has little understanding and will become much harder in future. I never finished grade 12 algebra because i was a fail at it back in my high school days. I now have a math avg of 85% which includes algebra, trig, and discrete math.