Edexcel currently run two syllabuses Geography A and Geography B.
If you are not sure which syllabus you are studying or which exam tier (foundation or higher) you are sitting check with your teacher.
There is a Facebook group: Home Education UK Exams & Alternatives, and an email group, the HE Exams Yahoogroup. It has two papers; for core, 1 hr and 2hr, and for extended, 1.5 hrs and 2.5hrs. The last sitting of Edexcel IGCSE specification 4MA0 was January 2018.
Edexcel IGCSE is two 2 hour papers with a formula sheet for each paper. How do the old and new GCSE maths compare for difficulty?
Students can achieve grades 5 to 3 on both tiers, and the exam papers will include some questions that are the same on both tiers.
This will help exam boards ensure that it is no more or less difficult to achieve the same grade on different tiers." Edexcel produce a document to help you decide which tier to enter? However, you can't usually do this in the same exam season, because Foundation and Higher tier maths will be timetabled in the same slot, on the assumption that nobody would do both.
There are ways round this, eg you could enter for Foundation IGCSE maths and Higher GCSE maths, or do IGCSE maths in the winter sitting and GCSE in the summer.
This decision tree was made by one home educator to help people choose the right tier for maths, but opinion is divided on when a 'strategic' approach to taking Higher tier.
Although you can retake the exam at Higher Tier after passing at Foundation level, in order to obtain a higher grade, generally students go straight for the most appropriate tier.
Ofqual's Advice January 2019: "There is nothing on certificates that details the tier of entry.