Limits & continuity
Building real intuition for what a limit means before the rules and shortcuts.
Calculus tutoring
Online Calculus Tutor: live, one-to-one, on Zoom.
Whether a student is catching up in a tough course or moving ahead into advanced material, Northstar offers personalized calculus coaching built around their class, pace, and goals.
$50 / 60 minutes · No long-term commitments · No required prepaid packages · 12-hour cancellation policy
What we cover
What calculus sessions can cover
Derivatives
Rules, the chain rule, implicit differentiation, related rates, and optimization.
Integrals
Antiderivatives, substitution, the Fundamental Theorem, area and accumulation.
Exam & course prep
Working through practice problems for upcoming quizzes, tests, and finals.
Precalculus gaps
Repairing the algebra, functions, and trig skills that make calculus feel harder.
College-level calculus
Support for university calculus courses and beyond.
Founded by a mathematics specialist
Northstar was founded by Joshua Lizardi, who holds an M.S. in Applied Mathematics, an M.S. in Data Analytics, a B.S. in Mathematics, and a Graduate Certificate in Applied Statistics, with 9+ years of teaching mathematics, including college and graduate-level instruction.
- Live one-to-one sessions through Zoom
- $50 per 60-minute session
- No long-term commitments or required prepaid packages
- 12-hour cancellation policy
- Flexible scheduling
- Payment through Zelle
Family cancellation policy, effective November 1, 2026
Cancel or reschedule with at least 12 hours' notice without charge. With less notice, the full $50 session fee may be charged. Student no-shows are generally charged the full scheduled fee. If Northstar cancels, you are not charged; any payment collected for that session is refunded or credited as appropriate. Rescheduling depends on mutual availability. Previously agreed individual exceptions are honored, and this policy does not apply to earlier sessions.
Private tutoring is $50 per 60-minute session. Invoices are typically issued after 4 tutoring sessions and paid through Zelle. Late-cancellation or no-show fees may appear on an invoice. No required prepaid packages or long-term commitments.
Full Terms of UseReady to make calculus make sense?
Tell us what course your student is taking and what they need help with.
Book a Session