The GED Testing Service has determined that the best calculator for the new GED 2014 test is the TI-30XS. Use of this calculator will be on the GED Math test as well as the GED Science test.
The GED testing service has several videos on using this calculator. The calculator videos can be located on the GED Testing Service website.
I have also found some great U-Tube videos on this calculator.... specific to the GED test. Check out the following: