Are 4 day gel nail courses good?? worth the money?? mbest ans to most helpful?

I'll be doing a 4 day gel nails course in April, one evening every week over 4 weeks, which is costing me 660, they promise to teach the History of nail enhancements - anatomy & physiology of the nail - nail diseases & disorders - product knowledge & mixed ratio - hygiene & salon safety - product application - using colours and glitters - using tips & forums - filing - refills & rewhites - troubleshooting - client aftercare - marketing and pricing your business - building a client base and a Theory and practical exam ... is it really possible to learn all of that over 4 days?? one evening a week!!! and to pass an exam??? Please answer this.. thanks in advance :)