请教一下：考lsat是不是必须要经过培训呢？有没有自学成才的途径呢？

That's correct.

5-8 weeks of full-time study could be sufficient to get a 170+ score, assuming a high level of English proficiency prior to LSAT study.

LSAT success is also a matter of practice. Even for someone who regularly gets 175-180 during practice tests, it's still possible to get a score no higher than 170 on the real test.

Thanks a lot

Really useful and encouraging words, and I have made up my mind to self-study.

坦率而言：

无论是国内的培训班，还是国外的培训机构，都是——“师傅领进门，修行在各人！”

如果方法得当，自己自学也可以获得不错的成绩。

如果真想培训一下，几十个人的大班，不如 “Private Tutoring——One-on-one solutions”，有针对性地一个一个地解决复习中遇到的问题。

遗憾的是大陆这边没有这样的服务。