I can’t verify your particular field or specialism but with mine, I would say it is absolutely vital.
My field is Biomedical Science but my specialism is in Clinical Biochemistry (I analyse your blood on a biochemical level (sodium, potassium, calcium etc…), spinal fluid, tissue fluid etc…). If however I was to go into haematology, I would be fairly hopelessly lost…
So I wouldn’t take my word for your subject area but in your subject, I would say in order for yourself to remain motivated, take what you find interesting or you’ll absolutely HATE your final year, which you can’t afford to do given it’s high level of importance. I repeated a year picking a module which is more in demand (immunology) but absolutely hated it and lost all motivation, so ended up doing Clinical Biochemistry the following year. Albeit my module was a bit bulkier than yours in terms of credits.
At Bachelors my credit worth was 30 out of 120.
At Masters, my credit worth was 45 out of 180.