Igcse new format mathematics

Guys I'm giving igcse mathematics in may june 2025. It's a retake since I didn't get a desirable grade before. Since calculator got removed I'm a bit curious how will we perform the basic calculations including square roots and all that. Also tell if there's a major change in the methodology of gce and igcse and if I can use olevel p1 for igcse p2 preparation. And Since olevel p1 was entirly non calculator. Can it be used to practice for non calculator or I should directly use the p2 igcse. Basically how should I prepare for the new igcse format. I'm really anxious if I'll get a good grade this time or not since time is short and I can't figure out stuff😭😭