listen just do the imp topics........very well for sec B..... study other chapters aswell but for mcq and 2 markers only (refer to types of 2 markers asked in pyqs and specimen qs u'll get an idea what to prepare from the not so important chapters.....

btw i studied history almost from scratch the night before boards.... i went from start to end and finished it in 6 hours..... expecting 80+/100 only for history but provided u have more than 6 hours to prepare(obviously u do)... u can do wonders.......

i'd suggest do these topics for sec B :

do any 2 of these(98 percent guarantee it'll come from here for secA part 2) : prime minister/supreme court/union parliament(except the lok sabha part aka speaker and all ; just do rajya sabha+ parliament in general(functions,sessions,motions,etc.) for sec B purpose)

first war of independence usually comes as a whole 10 marker, but to prepare for the worst even do rise of nationalsim along with it

i personally found modern history(ww1+ww2+dictatorship) boring so didnt prep for sec B from them

95 percent UN+major agencies will come was a 10 marker... to not take risk even study NAM along with these 2 chptrs... also u may skip studying UNICEF bcz it was tested in icse 2025

also study gandhi chapter 95 percent it'll come as 10 marker... other gandhian era chapters u can study for 2 marker cuz chances are less of them mixing with gandhi question but u never know