Short answer: at most Nigerian institutions, SIWES is assessed separately from your regular coursework -- typically pass/fail or credit-bearing -- rather than being averaged directly into your CGPA. But this varies by institution, so don't assume without checking your own department's policy.
Why it's usually separate
SIWES exists as a practical, industry-based requirement distinct from your academic coursework -- most institutions treat its assessment (via your logbook, report, and any review) as a separate compliance requirement rather than folding it into the same GPA calculation as your lecture-based courses.
What actually happens if it goes poorly
This depends on the specific issue and your institution's policy:
- A weak or incomplete report -- usually correctable through revision, similar to a correction round on any other academic document.
- An incomplete or unverifiable placement -- more serious, potentially requiring a delay or a repeat placement, since the core requirement (genuine industrial experience) wasn't actually fulfilled.
What to actually check
Your institution's SIWES handbook or your coordinator's specific guidance -- this is genuinely not standardized nationally, and assuming your friend's institution's policy applies to yours is a common source of confusion.
Where UniDraft fits in
A well-documented SIWES report -- built from your actual logbook and placement details, with your institution's specific formatting applied -- is the more controllable half of avoiding SIWES-related trouble. UniDraft handles exactly that part.