Is it correct to say “it’s a 5-year course or it’s a 5-years” can it be rephrased?

The correct phrase is "it's a 5-year course." The term "year" is used as an adjective to describe the length of the course. You wouldn't say "it's a 5-years" because "years" is not used in this context. It can be rephrased in several ways, such as: - "The course lasts 5 years." - "It's a course that takes 5 years to complete." - "It's a 5-year program." Feel free to choose any of these alternatives based on your preference!