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Panel 1
Ogie : Sitting with a serious face trying to do his homework
Aidan: Hey , How is it going with your homework

Panel 2
Ogie : Sigh – I don’t know, man. Accounting is really not my cup of tea. I’ve been trying to solve this for ages
Aidan: I see

Panel 3
Aidan: I think rather than tea you better drink some milk, my mom always said it helps to concentrate
Ogie :I’m not drinking tea …

Panel 4
Ogie : It actually means I don’t really like doing accounting, but having a cup of tea with milk is common in some countries.

Aidan: Really? I thought you use milk only with coffee. Let’s have a cuppa then!
Ogie : Sounds good! I need a break anyway.

From thefreedictionary.com
not one’s cup of tea
Fig. not one’s choice or preference. (Used to describe an activity you do not enjoy. Can sound somewhat affected.)