Firstly, To get high packages you should have the best knowledge and efficient industrial skills like coding etc. You should also have a good communication skill which will add an extra star on your ability.

Now, there can be a lot of reasons for low campus placement packages like:

1. Not so great infrastructure or reputation of the college.
2. No alumni networks.
3. Students skills are not efficient.

I hope my answer helps. All the very best for your future endeavors!