But I figure that with my grades and with my personality.

that后为何跟介词呢？不应该用名词从句吗？

网友的句子不完整，应为：

But I figure that with my grades and with my personality, I'll have no problem. 

1.  with my grades and with my personality, 介词短语作缘由状语，修饰后面的宾语从句，其实 with 介词短语也是宾语从句的一部分。with 的意思是“鉴于；考虑到”。

2. 意思：但我觉得，以我的成绩和个性，我不会有任何问题。