How to Learn Calculus - the beautiful way 

Hello Sir, i was doing amc 10 pyq then in amc 10B 2008 problem no. 24, as there is not written to take concave or convex quadilateral, i first taking convex quadilateral but i think that if i take concave quadrilateral it is easier and less time taking, so i take concave quadrilateral which follows all the statements given in the question. After solving i get answer 75° but in the solution, they take it convex quadilateral and the answer in the solution is 85°. As i did it in some questions and i will get the same answer so i also did it in this question also. So, can i change the diagram in which all the statements are followed or not? Sir also can you tell me that which chapter i have to do most for amc 10A.

Thank you so much sir Such a beautiful and crisp explanation Our eduction system needs guide like you To make people love mathematics 🙏

Sir that inequality book contains limits also what should we do with that

Hey sir, I'm a 2025 ISI aspirant. I recently joined AoPS website and I feel really overwhelmed by the questions and answers posted over there, like I generally understand ISI CMI subjective questions but seeing people solve those really really tough questions with solutions I dont understand even after reading them is really discouraging...Also, it seems like everyone over there is doing real analysis from like kaczor, rudin meanwhile I'm only doing calculus from IA Maron, it really doesnt seem like I have a chance. It seems like I'm gonna be against INMO level students and.. What's your opinion on this sir.