Are 17 credits too much for second semester?

I’m a freshman and i took 15 credits first semester and got a gpa of 3.2 and i’m taking 17 credits second semester.
This are my schedule for second sem.

Bio lecture (3 cr)
Bio lab (1 cr)
First year service (1 cr)
Statistics (3 cr)
Morality (3 cr)
English (3 cr)
Computer class (3 cr)

Im really worried cuz my mom told me to get 3.5 gpa and there are too many 3 credit coursres, but all of those courses are required in irder to stay in my major (my major is radiation therapy)

Are 17 credits too much?
How should i maintain 3.5 gpa?