I use online classes but in person is possible too depending on the location.
I've tutored students in A level Chemistry for 6 months now and have helped them improve their grades from E's to C's. I achieved an A* in A2 level Chemistry (A*AB in chem, pure math and physics) and am graduating with a BEng in Chemical Engineering in June.

My class structure usually goes as follows:-
deciding a topic to go over beforehand with the student; this encourages flexibility in case they have a test coming up soon/need clarification after going over it in class etc or would rather go with a topic of my choosing.

I provide notes, syllabus material and questions & past paper questions on the topic before the class to go over during it. I use syllabus material and complement this with my own knowledge to build up a strong understanding of key concepts before asking students to explain the material covered back to me. Depending on whether they can comfortably do so, we move on to questions (if one cannot, I try again from a different angle). Students have shared their feedback with me, verbatim: "your explanations are very good and make the content alot easier to understand".

Questions are very helpful for establishing clear means of communicating syllabus knowledge to the examiner in a way that earns all the available marks. It also helps the tutee understand exam question style and helps me understand what they need support with when it comes to answering them in actual exams - understanding the syllabus is helpful but communicating that knowledge via pen and paper onto the exam paper is critical to academic success.