See "Assessment" section in the course outline.

Did you score poorly in week-05 and/or week-12 lab exams?
one last offer!,

if you score 50% or more in the programming questions in the final exam, you will be offered the supplementary exam, even if you scored poorely in your lab exams.

If you score 50% or more in the supplementary exam, you can pass the course (with 50 PS). Your final marks will be calculated based on your original lab exam marks, so depending on your other marks, you could receive say PS, CR, DN or HD. In case your final marks are not enough to pass the course, I could increase the marks of the corresponding lab exam to 50% and calculate your final marks. In summary, the aim here is to help you pass the course provided you pass the supplementary!