Hi igtroy123123.
It's possible that you will score 730 when you take the GMAT. At the same time, in order to increase your score to that level, you need to be sure that "silly errors" are indeed what's holding your score below that level and that your plan for preparing will actually accomplish what you need to accomplish in order to achieve your score goal.
Regarding the errors, it could very well be that, as you suggested, you basically know how to answer the questions you see, but you're making silly errors and thus not getting enough questions correct to achieve your score goal. At the same time, it's often the case that what people believe to be silly errors are really errors they're making because of knowledge or skill gaps. So, to achieve your score goal, you need to be make sure that you're really just making silly errors and are not getting questions incorrect because you aren't clear enough about how to answer them correctly. If you're just making silly errors, then you can simply work on being more careful, focused, etc. to achieve your score goal, but if your errors are actually resulting from knowledge or skill gaps, then in order to achieve your score goal, you'll need to do some more topic-by-topic studying.
If you discover that it is the case that you're mostly just making silly or careless errors, your move to address the errors may be to use the
TTP Streaks Method, which involves seeking to answer questions correctly in streaks of 15 or more in a row. To do so, you'd pick a topic, for instance, number properties questions, and do practice questions involving that topic until you get 15 easy, 15 medium, and 10 to 15 hard questions involving that topic correct in a row. You can do the questions timed or untimed. The idea is simply to learn to get questions correct consistently. Then, you'd move on to the next topic and do the same thing. If you can consistently get questions correct in streaks of 15 in a row, you should achieve high accuracy when you take the GMAT.
Also, in using the
TTP Streaks Method, you may discover that you have knowledge or skill gaps in certain areas that you need to fill, in which case, you'd go back and review concepts or strategies to fill those gaps.
Overall, regardless of what you decide the source of your errors is or whether you decide to use the Streaks Method, you should go beyond taking more practice tests and do some topic-by-topic practice and possibly study to strengthen your skills and increase your accuracy.
For more tips on achieving higher accuracy, see this post on
Improving Your Accuracy on the GMAT.