Please take a look at the map.  

You can access the Academy from the main road (370), and there is a drop pin on the map that shows the entrance, labelled WTTC. However, depending on what time you arrive and what activities are also happening, the car park can sometimes be full.  

If the main car park is full, you can park on the main road before the zebra crossing or on the Broadoak side road behind the academy and walk in through the rear gate, which is open when a TT session is running.