Please Please Please guide me

Pcmb student here... Joined aakash ... Got into toppers batch ... scored 630-650 regularly until august-September ... stopped going to coaching bcoz I got interested in JEE . Started jee prep ... knew basic level (school) maths ... solved maths (Mains level) ...Did decent until December.... Here comes the sad part... Marks dropped ... barely pass in school exams ... neet mock went down to 300-450 (varies on test syllabus) .... Maths feels a burden ... But i want to be in IIT... MY QUESTION- Am I Dumb/incompetent for maths ? I do know it's a thing of practice but I reallystruggle at maths question and almost all advanced questions (PCM) bcoz I didn't do Coaching for JA. Do you know cases when someone who was weak at maths but cracked advanced? Is it too late? Should I go back to aakash? (Might sound a bit immature in this post , tbh I'm immature ... fked up my prep )