Calculator Programs
You can probably find any program you need at http://www.ticalc.org/pub/83plus/basic/math/calculus/(and if you're in AP Calculus, your teacher should've given a couple of these to you), but we've identified a few essential ones here for you.
Calculus
INTEGRALS - SIMPSON'S RULE: http://www.ticalc.org/pub/83plus/basic/math/calculus/apsimp_e.zip
INTEGRALS - TRAPEZOIDAL RULE: http://www.ticalc.org/pub/83plus/basic/math/calculus/aptrap_e.zip
SOLVING DIFF. EQ. - EULER'S METHOD: http://ww.ticalc.org/pub/83plus/basic/math/calculus/eulerjl.zip
SLOPE FIELDS - http://ww.ticalc.org/pub/83plus/basic/math/calculus/slopefield_83p.zip
INTEGRALS - TRAPEZOIDAL RULE: http://www.ticalc.org/pub/83plus/basic/math/calculus/aptrap_e.zip
SOLVING DIFF. EQ. - EULER'S METHOD: http://ww.ticalc.org/pub/83plus/basic/math/calculus/eulerjl.zip
SLOPE FIELDS - http://ww.ticalc.org/pub/83plus/basic/math/calculus/slopefield_83p.zip