Can I resit 2nd year of uni even if I pass the year?

I am in my second year at university. Last year I received a first with an average of 78%.

This years my marks haven't been so good. My coursework marks are on average about 50%. I'm really struggling with the course content as there's so much information this year. I will sit the exams as I've worked so hard for them over the year, but I have taken realistic predictions in saying I should achieve about 55% this year overall (2:2).

I have been actively revising since the start of the year, and during the past month I have worked 8 hours a day or so, but I am still very clueless at most things and I get a lot of answers wrong.

I have had health reasons which are approved by my university for the bad grades. Can I resit all of 2nd year, in attendance, even if I pass the 2nd year? Taking into consideration of my health reasons which have already been approved for me receiving extra time in exams this year.