Dilemma & Trauma of On-campus Placements

You will solve all questions in OA, yet still have to depend on luck to get the interview call. Someone who doesn't know how to traverse an array cracks 12 lpa. Some girls enjoy 3 years of B. Tech, no skills, no internships, no GitHub, no experience yet still crack 12+ lpa, yet hardworking girls who grind straight for 3 years won't even get shortlisted for OA. You drop a hall of shame interview, yet there is still a chance that you might get the offer. Randomly shortlisting students for OA. Nowadays some companies are asking DP/graph/tree questions in OA for a 4/8 lpa packages??!!!!! Some companies prefer incompetent female candidates over skilled male/female candidates, and the list goes on. It feels like 70% Luck and 30% hard work and skill. Why is it like that??? What actually happens behind the scenes amongst the interviewers and peeps from the HR department?? How do you actually end up choosing someone with 0 skills and 0 experience over a skilled and experienced candidate??