I would say computer delivered is better than taking the test on paper; This is primarily because of reading and writing sections where you don't lose time as you do on the paper based test.
My primary tip would be using "prepex.ai" for your practice test, there are so many available tests in the pro package. Moreover, start your digital diary on google doc or notion. After a couple of weeks' practicing, you will see substantial development in your typing speed.
Let me know how your development goes.