No. There is no guessing penalty on the Digital SAT — you should answer every question, even if you have to guess.
Every question is scored the same: correct gives you one raw point, wrong or blank gives you zero. Leaving a question blank is mathematically equivalent to getting it wrong.
If you run out of time, fill in a single letter across all remaining questions — statistically you will pick up about 25% of them.
If you have time to eliminate even one wrong answer, your expected value from guessing goes up significantly.
Drill free SAT questions by skill, take timed modules, and project your 1600-scale score.