It’s completely up to you, but you must consider where you’re up to, and if you’re going to miss out on any vital information. We recommend that you don’t stop. There are subjects with few changes, so if you can't complete a level before the syllabus update, keep studying but choose your subjects wisely.
For example - if you were to study everything but the Case Study under the current syllabus, and sit the Case Study under the 2019 syllabus, you might find you have a knowledge gap and will need extra support to catch up.
Ideally you should keep going, and try and complete the level you’re on by November. Or if you’re near the end of your level, complete the next one by November.
For full advice for the level that you’re on, see our syllabus update page.