Mathongo JEE Main Maths crash course- is it worth it?

Hi, I will keep it concise. Got 92.1 percentile in January attempt. My physics is good, chem is okay and my weak point is maths. I want to score around 45-50 in maths in second attempt, idk 99 percentile pe kya rank banegi, not chasing percentile, I want a rank under 20K, Delhi mein rehta hoon so this would be sufficient for me. I study in a reputed offline coaching, and rn my mother was suggesting to buy mathongo's maths crash course. Those who have purchased the course, could you please tell me what it's like? Would want to know as quickly as possible Thank you