Get a map board or bodge together some way of displaying a map on your handlebars so you can navigate as you ride.
Take a watch and make sure you make a note of the time when you set off.
Try to estimate how far you will be able to ride and plan a route accordingly. i.e. if you can average 7mph then you might expect to cover a route of 21miles in a 3 hour event. Knowing this means you have a chance to plan your optimum route to collect as many points as possible.
Try to keep moving. Avoid stopping to check the map, eat, drink etc. Aim to do all of this on the move or when you are stopped at a checkpoint anyway.
Try to plan a route that has some options in the second half of it so that you can extend or shorten depending on how you are doing. This might just be a case of doing your route clockwise rather than anticlockwise or vice versa in order to ensure that there are options in the latter half of your ride.
If you are entering as a pair remember that you are a team and work together to do well and have fun. Share the navigating so you are less likely to make mistakes, keep communicating, the stronger rider should avoid dropping the weaker rider on climbs as it will dishearten them. Rather ride with them as the company will encourage them to do better.
Have fun and enjoy riding on new trails – I have never done a TQ where I didn’t end up riding a trail I didn’t know about.
Chat to other riders after the event to discuss routes and tactics.