Final answer:
A J-1 student can only engage in Academic Training (AT) and cannot participate in Curricular Practical Training (CPT) or Optional Practical Training (OPT), which are exclusive to F-1 visa students. AT can be extended beyond 12 months in certain circumstances, but this is tied to specific conditions and program durations.
Step-by-step explanation:
As a J-1 student who has already completed 12 months of Academic Training (AT), the regulations typically allow for an amount of Academic Training that is equal to the time spent enrolled in the academic program, up to a maximum of 18 months, unless the student is in a post-doctoral program, in which case the maximum can be 36 months. In some circumstances, extending the AT beyond 12 months might be possible, contingent upon the length of your academic program and specific terms and conditions associated with your J-1 status. As for participating in other types of practical training such as Curricular Practical Training (CPT) or Optional Practical Training (OPT), these are exclusive to the F-1 student visa category and are not available for J-1 visa holders. Since you are a J-1 student, you cannot participate in CPT or OPT. It's important to consult with your Designated School Official (DSO) or program sponsor for specific guidance tailored to your situation.