1. Impersonation during an exam/interview.
2. Project work; end to end.
4. University degrees, including PhD end-to-end. You just need to attend a few classes.
A poor or lower-middle income family has very very few escape routes into middle income group. Educational credentials is one of the best ways. A college degree opens multiple doors; government jobs, interviews in private companies etc., So the clamour to get educational degree in India is almost unprecedented. For example, the competition to get into IITs is immense. Google "Kota tuitions" for gory details. Here's a small example[1][1] https://timesofindia.indiatimes.com/home/sunday-times/deep-f...