幫小二小朋友補英文, 佢好naughty, 點算好?

You need A LOT OF patience. Since it's mandatory, you can work with his/her (let's say 'he') parents. Here's one thing that work for me even for a class of 40:
-- Assign periods of "my time", "your time" (e.g. 5 minutes "your time" after every 20 minutes "my time")
-- At "my time", he has to do what I say and then he can enjoy his "your time" anything he wants (except destructive activities). Then he can watch 5 minutes TV or listen to music or play games with you or finish a puzzle.
-- Whenever he uses "my time" to do something else like running around, watching TV ..., he will be detained to compensate it until he completes what is assigned to be done that class. That means you will have to sacrifice your time; hence, you better teach him on a day you know you have no appointment or work. Don't worry, it will only take about 3 classes for him to test [your plan], adapt and get on track.
-- When he can finish his task in "my time", you may want to praise him with a little something he can play with in "your time" for the first time. Kids need to know their good deeds are recognised.
-- You tell him all about this new rules, what he has to do and result of not complying. You need his parents to work with you by letting you stay longer (when needed) and don't interrupt with dinner or other activities (to save him).
-- Don't get angry. It's his choice to punish himself with detention. Don't let him make you angry. He shall never have a sense of able to manipulate you to do what he wants. YOU are the boss.
-- He's probably grudging over his parents' idea of this private English class. You have to let him understand it's about learning, he's not being punished by having this class. Do more interactive things. Labelling things like a supermarket does not involve interaction, that's why it doesn't work. For example, you tell him a joke and he has to tell you a joke. Then, make him talk more by asking questions about his joke. No one is punished by listening and telling jokes. And talking is an interaction.
-- Important: STICK TO YOUR PLAN. Kids love testing your boundary. If you don't do what you say, you loose credit and they won't listen.

smack him when he is naughty, big big kiss when he is good boy^^

1. you need to find out what he is interested in
2. then try to talk with him about the interesting things he want to know, children burn with curiosity over what he does not know
3. everytime when the class is almost finished, tell him you will tearch him the new thing in the coming class and assign some tasks to him related to the new thing
4. Remember that teaching children depends on patience and curiosity, and building up the relationship day by day. After he has trust in you, he is willing to learn from what you teach

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其實你可以用遊戲的方式教佢英文啦，可能佢自己唔想補，係阿媽/阿爸要佢補，你就令佢覺得係同佢玩lo，我諗會好D。你收埋個remote，跟住如果佢答對左一個數目的題目你就俾佢睇好短時間，以獎勵方式，一係就送D小禮物lo