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What really matters here is how engaging can you keep the class while explaining questions.
Take things slow at a time and ask them questions from what you taught and if they don't solve it help them out and make them feel how easy it is!
Also, depending on the subject if you are able to give some practical applications that with this particular tool, we can solve problems like this this this and then solve examples related to it should help them understanding it in a better way
Moreover, you can divide them into groups and give some DIFFICULT questions to solve and on the weekend you can discuss it with them.
You can choose multiple leaders (who are good in that subject for that week) then you can ask them to build their team for a given week.
Keep changing the leader depending on who performs well in the whole activity!
Stuff like this shall really help students gain their interest on the subject.