In Singapore, L1R4 and L1R5 refer to different scoring systems used for the Singapore-Cambridge GCE O-Level examinations, which are taken by students typically at the end of their fourth year of secondary education (or tenth year of formal education).

1. L1R4: This stands for “L1, R4,” where “L1” refers to the first language, typically English, and “R4” refers to four relevant subjects. The L1R4 score is calculated by adding up the grades obtained in English (L1) and any three other relevant subjects (R4). The relevant subjects are typically chosen from a list of approved subjects and may include mathematics, science, humanities, and other elective subjects.
2. L1R5: Similarly, this stands for “L1, R5.” It includes the first language (L1) and five relevant subjects (R5). The L1R5 score is calculated by adding up the grades obtained in English (L1) and any four other relevant subjects (R5) from the list of approved subjects.

The L1R4 and L1R5 scores are used by secondary school students in Singapore as part of the criteria for admission to junior colleges, polytechnics, and institutes of technical education (ITEs) after completing their O-Level examinations. Different educational institutions may have different cutoff points based on these scores, and students with lower scores may have a better chance of being admitted to their desired course or institution.