Help with using technology:
Videos on various calculus topics:
Video Calculus, University of Houston

A diagnostic exam:
Diagnostic exam
Diagnostic Exam solutions, part 1, part 2, and part 3

Trig review materials:
You can start with Appendix C of your textbook (which includes lots of practice problems). After that, check out these websites:
Khan academy trig review materials
Paul's online notes algebra and trigonometry review
Paul's online notes trigonometry review for calculus students
Paul's online notes trigonometry summary sheet
Trig review problems plus solutions
Trig review worksheet

Some precalc review:
Lecture notes from different Calculus course: Click here

Some additional materials thanks to your instructors:
Mathematics Academic Resource Center::
Some on-line demos:

Interactive diagram that illustrates an area-accumulation function:
An area-accumulation function (by Harold Hausman)

A demonstration of secant line versus tangent line:
Secant/tangent demo