How much will a low grad score affect summer and final placements in NITIE (PGDIM), SJMSOM IIT B, and XLRI BM?

My cousin is an alumnus of NITIE and has spent two years in the institute as a student. His opinion is based on professional experience and may not be true for summer and final placements at SJMSOM and XLRI.

• Companies consider students with good grades as an equivalent proxy to dedication at the workplace, and the ability of the students to analyze critically and intensively.
• The merit required for the consideration is open to question and/or debate. Marks obtained in high school and graduation usually serve as filter criteria for filtering out worthy students from hundreds of them.
• Experience in work in domain and years or the lack of it and the college you completed your undergraduate degree from matter in a few cases.
• It is wrong to say that one of these matters will nullify and get you a place in the shortlist for the subsequent selection rounds.

A counter-argument can turn up claiming that the companies do not look at the scores. It is up to the students concerned to follow this notion.