Transferring to another school at the end of 10th grade is not an easy decision to make. From a college counseling point of view, if you are not challenged enough at the current school and want to transfer, or if there are other inevitable reasons, then usually your motivation will be justified. Other than those reasons, it is recommended to remain at the current school and graduate with good grades. If you still want to transfer, then you might want to consider the following things especially if you plan to apply to selective colleges later.

First, if possible, transfer to a more competitive high school with more rigorous academic programs. Even catholic high schools varies in terms of academic rigor, independent catholic schools (not diocesan schools) tend to have more challenging academic programs and their admission process is more selective. Thus, these schools tend to have higher SAT average scores and to send their graduates to more competitive colleges. Please keep in mind that there are still good diocesan schools too. I am curious which type of school you currently attend at this time. Or you can apply to non sectarian private schools which do not have any association with religious denominations. Many boarding schools are in this category.

我在美国一所独立高中任教。你能否告诉我为什么你要转学呢？你的学业成绩如何？
十年级读完转学读最后两年高中机会还是有不少的，因为现在留学生申请的学校很多，但只能去一所学校。一般，多数学校会有多余的名额空出来的。
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美国高中数学物理教师

Second, you mentioned that you would want to go California. I advise you that the location of the school is at this stage of your high school experience (you are going to be a junior) is not that important. Your focus is to find a right school that helps you to go to a better college if you transfer.

Third, although it is late to make a new application to a good school, there are still chances to get accepted to a better school. This just needs more works to find it. Application process for many good schools is officially over, nevertheless, some of these schools are still looking for good candidates for their schools if students are attractive. Prime Global

在10年级下半年转校是一个值得思考的问题。从大学咨询的角度来看，如果你认为目前学校课业难度满足不了自己的需求，或是其他特殊原因所致你必须转校的话，除此之外，还是建议你留在目前的学校，并且争取得到更好的分数。特别是，你将来的目标是名牌大学的话 那么请考虑下面几点因素：

首先，如果有可能的话转到更具有竞争力，学术课程更难的高中。不同天主学校课业难度差别也很大。独立的天主教学校往往有更多具有挑战性的学术课程，他们对学生的录取也往往精挑细选。因此，这些学校通常有较高的SAT平均分，他们的毕业生会进入到更具竞争力的院校。请注意，还有不错的教区学校。我很好奇你目前就读的学校属于什么类型。或是你也可以考虑非教派的私立学校。许多寄宿学校属于这一类。

其次，你提到想去加州。我建议你现在考虑的重点应该放在什么样的学校可以帮助你进入更好的大学就读，而不是学校的位置。
第三，虽然现在申请名校已经为时已晚，但是你仍然还是有机会去好学校就读。只是需要花更多精力去寻找和申请。即使很多学校的申请截止日期已过，如果你学习背景经历等足够优秀的话还是有很多机会的。
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