Take an official MBA com mock next.
If your Jamboree scores are ranging from 595 to 675, you need a more reliable calibration before deciding whether to book the exam. Third-party mocks can be useful for practice, but official mocks are much better for judging where you actually stand.
I’d do this:
1. Take one official mock under real test conditions.
2. Review it deeply: wrong answers, slow correct answers, timing issues.
3. Compare the score to your target.
4. If you are within ~20-30 points of target, consider booking soon.
5. If you are 50+ points away, spend 2-3 weeks fixing the biggest weaknesses before testing again.
Use GMAT Club mocks only after that, mainly for extra practice or targeted sections. Don’t let a third-party score decide your test date.
I built a free GMAT planning tool from real debrief patterns that may help you compare mock ranges and decide when to test: prepsignals.vercel.app
Short answer: official mock first, then decide.