My suggestion:
(which is why) the/this module was allocated two selection from the lower hierarchy of the selection module.

Just guessing!

is the term in programming

I think they are talking about the school courses the student took. Here is a description from the link:
"Drexel University’s Master of Science in Software Engineering degree program was created in response to the growing importance of software to the national infrastructure and the rapid rise in demand for professional software engineers. All students in the program take a core curriculum that spans the scope of disciplinary areas relevant to the degree, thereby providing a common foundation for all students in the program. Students also elect an area of concentration, or track — a cohesive, more specialized set of courses that builds on the core to support each student’s particular career interest. Three tracks are available: information science and technology, computer science, and engineering. The average time to complete this master’s degree is three years of part-time study."

The core courses are ones everybody in that major must take and then they take other courses to increase their understanding.

My thoughts from the USA.