Mature student,started uni in Sept and strugggling with course. need advice pls

Hi,
I started Uni in Sept, Engineering, and I'm finding the workload tough. I find there is little time to absorb the information and revise. I previously completed an Access Course and managed to get top grades but that was from long hours of non stop studying everyday with no life. During that course I had a feeling that I might have learning difficulties such as dyslexia, but as it's difficult to get tested brushed it off. When I started Uni I did have access to be tested but as the course picked up the pace I found little time to get tested and brushed it off again, thinking I just need to focus. Now this week we have online exams and I just feel I have not absorbed anything in the past month and a half at Uni and feel I will fail the online exams which contribute 5% to my final grade. Today I approached the learning disabilities department and did a screening test and it did suggest that I am Dyslexic. At this point, if I fail the online tests I'm not sure if I will get kicked off and if not, I'm dreading that we are moving on to more intense work after this week that is suppose to build on what I should have absorbed and learned at the begining. I feel throwing in the towel is a bad choice as I struggled to get this far. Need advice pls