When it comes to studying, I'm dead lazy. Most of the time I couldn't care whether I get 70% or 99%, besides being somewhat happy after getting a 99% back. As a result my grades aren't all that good, especially for the courses I find boring. However, when it comes to practical tasks that one would get in industry I'm better than many of the students who obtain better grades.
How important are grades when applying for a job? Are there other things that you could do to make your CV look more impressive even with mediocre grades? For example, I do really well at programming competitions and teach other top students on algorithms and data structures that are beyond the scope of the university syllabus.
Obviously I'm referring to a job at a software engineering company, if that makes any difference.
EDIT: Pasting a comment I made further down
I'm only lazy when it comes to boring things I find too easy. When the work is challenging I'm extremely well-motivated. Right now I'm doing some very interesting work for my masters degree and as a result it's looking like I could get it out in a year as opposed to the average of two years
EDIT2: Types of classes/questions that pull my grades down
The types of classes/questions that pull my grades down are those that require you to memorise chapters of a book. For example, draw a diagram of the DES encryption algorithm and explain each step. They could have asked any one of many algorithms, so in order to ace the test you'd need to memorise them all fairly well. Another example is reciting page-long proofs that are impossible to come up with on-the-spot and have to be memorised to some degree before the test.
EDIT3: Some background
Just to add some background to my personal experience. I am currently studying masters in Computer Science. I have completed internships at Google and NVIDIA and got excellent reviews. I got in by strong referrals, and without them I'm not sure I'd have gotten in. I'm interested in what it's like without such strong referrals, which is the positions we're in most of the time.