Don't be afraid to ask questions of professional educators, or even consider a one-on-one tutor. If something doesn't make sense, ask the teacher. If that fails, ask it here (be sure to include all the context). If that still doesn't work, consider a one-on-one tutor.
It is also a good idea to work on time management. Focus on the easier tasks first, to save up time for the harder tasks. And don't stress about time. If you aren't able to finish in the allotted time, you are entitled to accommodations.
Maybe you should start with the easier questions first, so you will have more time to stick with the harder ones. Also read over what you nedd to learn everyday. Repeat this and you will gradually begin to understand the lesson and have a better grasp in what evr you are kearning. Dont stress too much!