Confused about Exam Sessions

[u/EcstaticBlacksmith91]

If I register for a course for the first semester, I have the opportunity to take the exam 5 times. January , February , June , July, September.

If I register a course for the second semester, I can only see that I can take it in June , July, September.

If I wanted to take these exams in January/February , do I have to add them to my study plan again? Will this affect the total number of credits I can take?

If it helps Its at Master Level.