My only regret as far as prelims goes was my 2018 attempt. Prior to that and also after 2018 I easily cleared the cutoff of civils and many a times of Forest service also.
I will tell you only 1 thing.
In last one month, those 10 odd basic books like Shankar, Laxmikant Spectrum etc will be of paramount importance. Just keep on reading same geography NCERTs, same macroeconomic NCERT etc and you will sail through.
At the end of the day , 60 questions will come from these sources. You need 45 Net correct. From next 40, even with 2-3 readings of Current Affairs one can get 10 net correct.
110 is more than enough to clear this exam.
PS: I scored 128-135 in 2020.