How many credits do you need to pass NCEA level 1 science?

How do you mean? You don't pass subject by subject.. In total you must have 80 NCEA level 2 or higher credits to pass the year. English is the only subject in which you need a specific amount of credits (8, but speeches don't count towards this) to gain University Entrance, which are the literary credits, 4 reading and 4 writing. In level 1 however, 8 math credits are needed to gain UE.