Here are some top websites to download PDF notes on Math 103 topics:

1. *OpenStax* ((link unavailable)): Offers free, peer-reviewed, and openly licensed textbooks, including mathematics.
2. *MIT OpenCourseWare* ((link unavailable)): Provides free lecture notes, assignments, and exams for various math courses, including calculus and algebra.
3. *Khan Academy* ((link unavailable)): Offers free PDF notes and resources on various math topics, including algebra, calculus, and trigonometry.
4. *Math Open Reference* ((link unavailable)): Provides interactive math reference materials, including algebra, geometry, and calculus.
5. *Purplemath* ((link unavailable)): Offers detailed, illustrated math lessons and examples, covering algebra, calculus, and more.
6. *SOS Math* ((link unavailable)): Provides detailed math lessons, examples, and practice problems, covering algebra, calculus, and more.
7. *Mathway* ((link unavailable)): Offers an online math problem solver, as well as downloadable PDF notes on various math topics.

Some popular PDF notes and textbooks for Math 103 include:

- *"Calculus" by Michael Spivak* (available on OpenStax)
- *"Algebra and Trigonometry" by James Stewart* (available on OpenStax)
- *"Math 103 Notes" by University of Michigan* (available on MIT OpenCourseWare)

Remember to always verify the credibility and accuracy of the sources you use.