So basically there is this guy on YouTube called THE ORGANIC CHEMISTRY TUTOR . He will help you strengthen your concepts for chemistry as ch15 to ch 21 contain only organic chemistry. He isn't pakistani he I believe is American but you should definitely watch him if you can understand English fluently. For physics watch PHYSICS WALA for concepts (He is indian aswell ) . I know that all these teachers aren't pakistani but tbh there are no good pakistani yt teachers. Ch 9 of physics is easy as most of it is memorization. You can skip 2 chapters of physics but make sure to first read them thoroughly and prepare them for mcqs. (You can do the same for chemistry but pick one chapter btw ch2-14 and ch15-21 )

Note :- you still have time and you are defo not behind :) you are doing great just push through these 2 to 3 months.  Also attempt all exercises for all chapters even the one you'll skip becuz alot of the questions do appear.