Pension related question

I graduated uni here at september, ever since I was a student I was exampted from Pension.

Started working for my company At February. Now they ask me to pay my pension from October to February. I dont seem to understand I had no income during these 5 months, how can I be taxed??

Im not sure how this works, can I get exempted or partially exampted?

by ZealousidealSky9959