按照你所給句子,只能這樣理解才可能正確：
If you're a visual learner,chances are 【that引導(dǎo)表語從句,省略】you did well on spelling tests,and so you have a sense of the rightness of spelling.
句子結(jié)構(gòu)劃分：
【If you're a visual learner條件狀語從句】,【chances】【 are 】【（that）you did well on spelling tests表語從句】,【and so you have a sense of the rightness of spelling 并列句】.
句子意思：
如果你是一個視覺型學(xué)習(xí)者,可能你在拼寫測試中曾做得很好,因此（可知）你有拼寫的正確感.
祝你開心如意!