It has been 8 months after angioplasty is it necessary to have to have 2nd angiogram to check how the arteries are now.

No. Angiograms are NOT done routinely post angioplasty or stents. Only symptoms and/or abnormal stress tests define need for angiograms.
Probably Not. Without ALL of the specifics your question is hard to answer...but... in general no, a repeat is not needed.