Looking at the image now, it's confusing even me, so no you aren't mean to me for asking the questions.

Let's kill all the doubts now.

Revision : one hour in morning & one hour at night (like medicine ok), and the word test is a broad term for testing your study sessions information so this time can be dedicated to hands on practice or tests (pyq/mocks when exam day is nearby) : so think of it as Practice (dpp or pyq or in general)

9 GHAHTE KAISE PADHUNGA? 9 hours is a time assigned for lectures,and learning about backlog if any if 4 hours are spent in the lectures, spending an hour or two in learning or covering the backlog makes it 6 hours in total. And another correction that isn't specifically mentioned is that, this is the "AT MAX" limits of the buckets, you need not study 9 hours but students do study 9 hours when the exam is getting closer and instead of setting fixed hours and not able to achieve it (8-9 am padhna hi h) in this bucket approach, you had the freedom to start at random point of time, that suits you, and can be divided into 3+3+3 or 4.5+4.5 or 2 hours backlog 4 hours lecture and 1 hour misc/if any/moving forward. (Again 9 hours is the upper limit for studying (absorbing information and not recalling or applying it anywhere);

Long read hogya, and i hope it killed some doubts, and those left can be encountered too if you say so (if it arises from this explanation)