Can Admission Portal Scores Actually Be hacked?

Counselling for my exam starts in like a week and I randomly went down a rabbit hole seeing people online claiming they can “change scores” or edit stuff on admission portals. I’m not trying to do it, I’m just genuinely curious how realistic this even is in 2026. Like, can someone actually hack into an admission portal and modify scores/ranks without getting caught later? Or is this one of those things where 99% are just scammers taking money from desperate students? What confused me even more was the pricing :| Some people were saying they could do it for $100 while others were quoting $750+ like it’s some premium service or something. If it was real, wouldn’t exam authorities instantly notice during verification or counselling? Anyone here from tech/cybersecurity or knows how these portals actually work? Curious how possible/impossible this stuff really is.