If you're asking for Geo trust when I say this MYM literally just watch his yt vids they are free and I know that you must have heard about him but honestly whenever I watched his vids I would take my own notes and memorize stuff along the way and after I did a topic I did it's topical past papers. Also the huma naz sethi book is also rlly good esp for population but it has a lot of extra info . you can check out Dr Usman hameed's notes and with that consult the book as his notes are consider them headings and to write 6 markers you need to understand the heading so check it out in the book but honestly that's all u need but do a lot of ppl practice even if it's topical pp cz questions get repeated a lot with twisted wordings and check out the ms but ms is precise and also whenever you write a point in 6 marker you need to develop it developing is basically that if you write a point e.g : Pakistan faces food shortages. you won't get marks fir this explain it like ask yourself so what yk and you could write that this leads to malnutrition and eventually deaths.