general query (examiner's perspective)

Hi Tutor, for example if a question is worth 4 marks and let's just assume candidates need to write 4 sentences(each sentence with 1 valid point) to score those 4 marks. During the exam, what if i wrote 6 sentences (each with its own point) and the let's assume that the first two sentences are wrong. Then will the examiner only review the 2 more sentences (since the question is worth 4 marks) ? or will the examiner review whole 6 sentences to give as much point as possible.