Paper 1 (Listening and understanding in Arabic) is 50 marks Paper 2 (Speaking in Arabic) is 70 marks Paper 3 (Reading and understanding in Arabic) is 50 marks Paper 4 (Writing in Arabic) is 60 marks
However, each paper is worth 25% of the total qualification, so they scale/weight the marks from each paper. According to page 65 of the specification, this is done by applying the following scaling factor to each paper so they're all "worth" 70 marks:
Paper 1: 1.400 (as 50 marks x 1.400 is 70 marks) Paper 2: 1.000 (as 70 marks x 1.000 is 70 marks) Paper 3: 1.400 (as 50 marks x 1.400 is 70 marks) Paper 4: 1.167 (as 60 marks x 1.167 is 70 marks)
The final mark is therefore out of 280 (4 papers at 70 marks per paper), which tallies with what I can see on the grade boundaries document.