perini plumbing and mechanical contractors exist or are a scam company Sylmar, California

Something similar to the other reports happened to me with this company except that I can not figure out where this company profits with this scam.  I had to pay a 3rd party company $25.00 for the CTE study manual in order to prepare for this company's pre-employment exam but once I read these reports I immediately contacted the CTE study guide company and got a refund in less than 24 hours.  I am not sure what this company Perini is up to but it definitely is shady.  A company that advertises they are nationwide and hire electricians, plumbers and mechanical contractors with free in-house training is addressed to a PO Box????  That alone is shady.  Not to mention this Peter Johnson character and Larry Peterson that claim to be the HR manager and Recruiting manager.  The second piece of shadyness relates to the emails these individuals send.  Mis-spelled words and improper pronunciation.  I think a HR manager and Recruiting manager are educated enough to not misspell words and use improper pronunciation.  Maybe it's me but something is overall weird about this company.  I reported them to the BBB as well.  They already have a D rating, which means do not deal with this company.