E-GMAT Free Trial Design Strategy

Your accuracy depends on a lot of things:

1. Your ability: as long as you were not aware of the questions in the GMATPreps before doing them, we can safely assume that you are already better than V30 (your scores are between ~60 and ~70 percentile).
2. The difficulty level of the questions you are attempting: if the questions you are attempting are very difficult, your accuracy is expected to go down dramatically.
3. The quality of the questions you are attempting: if the questions themselves are not very good, even a very good test taker will struggle to get them correct (because there may be no, or no clear, correct answer).
4. Whether you are taking an adaptive test: the GMAT adapts to your performance, while this particular test might not. In an adaptive test, accuracy is not necessarily very indicative of performance.

My advice to you is to continue using these questions if they are of high quality and you feel that they can play a role in your prep at this stage. If they are not or you do not feel that they "fit", drop them. Our advice to students is to focus on only official questions in the last stretch.