REAL PLACEMENT SCENARIO

I want a senior to answer these questions very honest (real guidance needed)-

i'm planning to jo|n the college (score 77.8 in 10+2, 88.3 in JEE)

how are the placements actually?
how many companies?
real placement percentage?
overall median? top 20% median?
what percentage of students actually crack 15+ LPA?
importance of 10+2 marks and CGPA during placements? ideal score?

a helpful answer would be greatly appreciated :)