There is no legal, permanent "free" serial number for EViews 12 student version. Any website claiming otherwise is either mistaken or malicious.
You can buy a 6-month or 12-month student license directly from the EViews website. serial number eviews 12 student version
If you cannot afford a license or obtain a serial number through your university, consider these legal, free (or low-cost) alternatives. While they are not EViews, they perform similar econometric tasks. There is no legal, permanent "free" serial number