The best replacement for stc is nrc.

The best alternatives to stc are rated as following:
★★★★★  nrc
★★★★★  kaplan
★★★★  ptc
★★★  iic
★★★  nic
★★  cac
★★  noct
★★  oitc
★★  rw
★★  master cardiology
★★  fstc
★★  mobily
★  decibel
★  337
★  mobily 4g
★  knopman
★  dearborn
★  nrc rating
★  training consultants
★  decibels
  dstc
  under offer
  pma
  cic
  nrc ratings
  tso

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stc
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kaplan