To obtain a student copy of Mathematica, visit the following ITS web site: https://help.lafayette.edu/mathematica/students.
There are a variety of on-line tutorials available for Mathematica. I recommend going to Wolfram.com and exploring their on-line resources. Some students have reported the following to be useful:
The National Institute of Technology and Standards maintains a useful page with the current best values for many fundamental constants, at http://physics.nist.gov/cuu/Constants/.
The July 2014 issue of Physics Today included an interesting article about a proposed revamping of the standards used for many fundamental constants. You can read about it in the article A more fundamental International System of Units.