Dear Aarif, 

In order to become eligible for CA CPT 2018 December session examination, if  you registered for Common Proficiency Course (CPC) with BOS before June 30, 2017, then you are eligible to appear for the test. If you didn't, then you will need to enroll yourself in the new scheme of examination of CA entry-level, i.e. CA Foundation Course. 

You can check all about CA CPT 2018 (December session) and CA Foundation exam in the links given below: 
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CA Foundation 2018

CA CPT 2018 (December)

Hope it will give you all the required information. 

All the best!