GCSE Arabic, which is a Modern Foreign Language (MFL), is a tiered 9-1 qualification.
Available grades for candidates entered on the Higher Tier will be 9-4, with an allowed Grade 3 for candidates who do not quite achieve Grade 4.
Available grades for candidates entered on the foundation Tier will be 5-1.
Edited source: https://qualifications.pearson.com/en/support/support-topics/results-certification/understanding-marks-and-grades/9-1-awarding-faqs.html