Original sentence: In some subjects, IGCSE can be taken with or without coursework, making it suitable for schools with less specialised staff.Most IGCSE subjects offer a choice of Core or Extended papers in Cambridge, and foundation or higher papers in Edexel.This is designed to make IGCSE suitable for students with varying levels of ability
Edited sentence: In some subjects IGCSE can be taken with or without coursework, making it suitable for schools with less specialised staff.Students believe that the Cambridge IGCSE is more challenging and stimulating than the Edexcel IGCSE.With a choice of Core and Extended papers in most subjects, IGCSE is suitable for students of different ability levels