I thought Codeforces Round 1121 (Div. 2)'s sudden change in starting time (Sep/13/2026 20:05 (Moscow time)) is already bad, since users in Asia countries (China, Vietnam, Japan, etc.) will have to stay up until 2 am, 3 am, maybe even 5 am to do the round, but why are the next few rounds also have, if not unusual, unreasonable starting time. Although it makes doing Codeforces rounds more accessible for Europeans/Americans, many of those that are familiar with the old starting time will be unable to do these rounds, especially students who need to clear their schedules and go to sleep (or do something similar) a bit later to do Codeforces rounds. I don't mean changes are bad, but I think sticking with the 14:35 UTC starting time will be more ideal than constantly changing starting times of the next few rounds.

Now that I'd been learning CP for around 2 years now (I'm bad at it though), I decided to hop on Codeforces and start doing contests for Div. 3 and Div. 2. However, I wasn't able to go through the full problemset of these contests before going offline because of my timezone. Besides from doing other contests in virtual mode, I decided to also start learning and doing problems on CSES Problem Set to improve my CP skills. Have any of you ever had such experience or anything similar? Should I grind problems on CSES Problem Set? Please give me some advice on whether or not I should seriously learn CP from CSES, I'm having a very important exam next year that requires CP skills so I have 1 year left to prepare.

P.S. Sorry if my language feels rather unnatural, English isn't my mother tongue.