The Sebulba boss battle in Star Wars: Galactic Racer will prove difficult if one does not control speed and skills wisely. Being an incredibly swift and ferocious racer, Sebulba can easily overtake you if you make any mistakes.
One has to skillfully utilise his Afterburner, Ramjet and other skills in order to match the pace with Sebulba. With a proper set-up and a few strategies, one can defeat Sebulba and progress further in the game.
How to Beat Sebulba in Star Wars: Galactic Racer

Sebulba is one of the first great opponents you will come across in the Star Wars: Galactic Racer game. In the game, you will have to control speed, boosts, and your aggressive driving style. Prior to engaging in the race, go and talk to Hibi in the paddock and install upgrades for cooling, acceleration, and takedown awards.
The recommended upgrades are Enhanced Coolant I, Lethal Velocity I, Burn Protection, and Spark Plugs II. You need to get the Overcharged Autopilot power-up as well. With this setup, you will be able to control your Afterburner and keep the speed in the race.
Use Afterburner Carefully

The Afterburner is one of the most vital components for ensuring that you keep up with Sebulba. Avoid employing this feature when approaching corners since its added speed will cause problems with staying on course. Use your Afterburner only when going through straight lines and after exiting corners, since this way you can maintain your speed and control.
Ram Sebulba Whenever Possible

Do not run the race in a regular manner. Star Wars: Galactic Racer rewards players with aggressive driving, such as crashing and taking down the opponent. Take Sebulba out with the Ramjet when you are near him. Taking down the opponent is effective not only in slowing him down but also in boosting your speed when combined with Lethal Velocity I. This makes aggressive attacks useful for both slowing Sebulba down and improving your own pace.
Use Autopilot to Recharge
The Overcharged Autopilot power will allow you to conserve your energy for the race. The Autopilot is used to recharge your battery, after which you should utilize the energy for your other powers. You should not use Autopilot in tricky turns because you should be able to navigate the course to avoid losing precious time.
Focus on Clean Racing Lines
Sebulba is an aggressive adversary, but you don’t have to battle against him every inch of the way. Rather, it is important that you try to maintain your speed and avoid crashing into anything. Once you get a chance to pass him when he is going straight ahead, use your boost and ram jet together to overtake him. After overtaking, rather than trying to attack him all the time, concentrate on taking good turns. Defeating Sebulba at the end of Act 1 allows you to progress into the Galactic League and continue the campaign.

