Jim, picking up from Prof. Kapstein and Andrea Acri, I am reminded that in Hindi, the "key" or "Cliff Notes" that people use to study for exams here in India is called a kuñjī. Basically, with the right kuñjī, you can "crack" an entrance exam. I realize that the door-key-opening-breaking through metaphor is continuing here, from kuṇḍalinī yoga to the IIT qualifying test, which yields its own version of mokṣa for the successful candidates. And certainly getting through such ordeals to breach the portals of these vaunted institutions -- engineering / medical / architecture / management / law colleges -- requires a certain haṭha, determination, force, effort, discipline, rigour, zor-zabardastī!
I see you don't really need our help, except as a form of "time-pass" in this unending lockdown...
Yours,
AV.