通过了学校语言测试也可以的，你会拿到学校的一封语言课的成绩单，应该也是有效的拿来续签。
要求页面：
http://www.ukba.homeoffice.gov.uk/studyingintheuk/adult-students/can-you-apply/english-language/下面是签证处的条例：
If your confirmation of acceptance for studies (CAS) was assigned to you before 21 April 2011, your education provider must ensure that you are competent in English at a minimum of level B1 of the Common European Framework of Reference for Languages (CEFR) unless:
如果你是4月21前拿到的offer，那么在B1，这个最基本条件下，如果你可以达到以下任一条件，就不用提供B2的雅思成绩：
your course is at or above level 6 of the revised National Qualifications Framework (equivalent to a UK bachelor's degree); or
your course is a foundation degree, or an HND in Scotland; or
your course is a pre-sessional course that you will take before taking a degree course in the UK; or （你在进入大学前有课程，是一个语言课程，也就是楼主所说的你现在的语言课offer）
you are a government-sponsored student who wants to study an English language course; or
you are a national of a majority English-speaking country (see below).
You must still meet the English language requirement if you want to study an English language course (unless you are covered by one of the exemptions above).
你必须有达到语言要求的成绩，除非上述条件你有任一。
所以说，现在楼主不用考雅思，到英国上完语言课，你pass了，学校会帮你出具一个语言的成绩，你也可以在英国续签了。一般学校会有一个international student的管理处，然后他们会负责帮忙做这件事情的。