Usually, ICAI announces for CPT exam form during April (for June attempt)Accordingly, for June 2018 attempt, ICAI will come out with exam form on april month and you have around 20–25days to submit it.Wait for the preceding attempts result i.e. Dec. 2017 which will be announce on Mid. January 2018, and in around April 2018, Exam Form windows may be open for exam form.(PS - by Form, you would meant to be Exam form for the attempt)Hope, it helps.Thanks.