请问在加拿大读研（理工科）总共花费（生活费+学费）读完学要多少钱？

You are talking about cost of living and tuition. Count on 25,000 to 30,000 Canadians per year, ie about170,000 to 210,000 RMB.

You didn't say if you are talking about MSc or MPhil/PhD. Put it this way, alot of Chinese don't know the difference. For MSc, count on a year, or 2 years if you need to repeat some 4th year courses. For MPhil, about 2 years, and PhD, 2 to 8 years.

研究生预科? Is there such a thing? I have never heard about this in my life and career in university education. For MSc, for sure, we don't have that. For MPhil and PhD, there is the conditional admission if you have to repeat some 4th year courses.

加拿大申请硕士的基本条件：

大学毕业，获得学士学位，
大学成绩的平均绩点在3.0以上或主课平均分75分以上
托福：580 以上（其中写作4.5分） 或雅思：6.5
理工科的学生需要具备GRE2000（笔试）或1400+作文5.5（机考）；管理类学生需要具备 GMAT成绩600分以上

加拿大研究生录取竞争非常激烈，以上只是申请的基本条件，同时，理工科申请人能否被录取，还取决于指导导师的意见。 指导导师会根据学生的教育背景及相关领域的研究经历选择与其研究课题有助的学生。

研究生签证要求

申请人的要求：提供