help rn pls pls plsplsplspls

1. physics: how do u guys master motion in a plane and 2d kinematics? especially the relative motion and projectile stuff.. are there any specific "tricks" or should i just keep grinding the same types of problems? also when does rotation start getting hard??
2. chem: stoichiometry is killing me lol. the basic mole concept is fine but once they add limiting reagents and concentration terms like molarity/molality in mixed problems i get so confused. any good way to visualize these? like jeelevl all qstns anbd some ncert
3. math: should i start calculus (differentiation/integration) right now? some people say its needed for physics mechanics but my math teacher hasn't started it yet. is it worth self-studying early?
4. higher algebra: is permutations and combinations (pnc) actually solvable or is it just pure luck if u get the logic right? i feel like i spend 20 mins on one question and still get it wrong.

hwo to study everyday sincerely how to developpls suggest what books or yt channels actually show the step-by-step logic for these specific chapters. i feel like i have the potential but the "approach" to the questions is missing.

also how do u guys handle backlogs if u miss one week of these core chapters?

TL;DR: struggling with the logic for class 11 mechanics, pnc, and stoichiometry. need tips on how to actually solve advanced level questions.