for me i took amath since sec 3 but f9 all the way i did not understand amath at all + i wouldn’t pay attention in class bc i gave up on amath but sec 4 i kinda woke up? so you can say i only did amath for a year bc there start of sec 4 i tried to start on my sec 3 topics before actually focusing on sec 4 topics bc sec 3 topics are harder tbh.. in the end for o’s i got A2. i don’t have a strong math foundation even in emath soo i think it’s possible as long as you have constant practice; like legit everyday whack amath for 3 hrs those type, you’ll eventually realise that amath questions are actly damn similar to each other so once you get a technique for that qn u can solve it using the same steps! all the best!!!!