Yes, you may write notes on the card if you wish. However, at Lifestyle Training Centre, we do not recommend writing anything during the preparation time as it could be a waste of valuable time. Instead, thoroughly read and understand the role play. Take your time and read slowly without panicking. Three minutes are more than sufficient.
If you have any doubts regarding the role play or specific vocabulary, feel free to ask the interlocutor, as they are obligated to answer any questions during the initial three minutes of preparation.