beforehand (adv)

He packed his luggage beforehand, so he was able to leave right away.
Knowing they had a busy day ahead, they prepared their lunch and laid out their work clothes beforehand to save time in the morning.
She studied the presentation materials beforehand, so she was well-prepared for the important meeting with the clients.
To ensure a smooth and stress-free vacation, they booked their accommodation and planned their itinerary beforehand, leaving no room for last-minute surprises.