I am an experienced professional with advanced degrees in Engineering
and Business and am looking to quickly improve my Excel and Powerpoint
skills.
I am based in New York City.

In this context, I am trying to identify resources available for
accelerated learning of Excel and Powerpoint.

The resources could include:
Individuals (personal tutors) & Organizations (training centers) ? be
it in New York city (for in person interactions) or around the world
(for virtual online traning); Web-sites; Computer based training
modules (CBTs); Books; etc?
 
I would like to get specific cost information for each resource
identified ? and where possible an assessment of the quality of the
resource (customer testimonials, rankings, etc?)