I have not started processing I stayed more than 6 months cumulatively,but I didn't stay 6 months in a stretch, my first degree was in Benin and I come back to Nigeria after each semester . Do I still need Pcc?
If you never stayed up to 6 months or more in a stretch at any given time in Benin, then you don't need Benin PCC according to the new IRCC PCC requirement.
After filling the Travel history in your e-APR, the section where you need to attach supporting documents will automatically generate a request to upload PCC for your Country of origin and any other countries where you have stayed up to 6 months or more in a stretch.
Hence in e-APR, you won't get a PCC upload request for Benin if your Benin travel history is less than 6 months in a stretch. If this is so for you, then you can proceed with e-APR submission without Benin PCC.
However, even though it's rare, please note that some immigration/case officers may request at a later time during the PR application process for PCC as ADR (Additional Request) from applicants with stay less than 6 months due to reasons known to them.
So I will advise that even if though you submit the e-APR without the need for Benin PCC, still go ahead to obtain the Benin PCC so you have it in hand in case you're asked to submit it at a later time as ADR during the PR process.
This will save you time in case you're asked at a later time to submit!