Greetings!
If you're shaky with maths, I don't think you should do Actuarial. If you're not certain about your maths skills, you should be able to try ACST101, but most Actuaries get an easy D or HD in it. From the Actuaries in my cohort that I know, the only Actuaries who got Credit (and in VERY rare circumstances, Pass) in ACST101 are those who aren't on pace to complete their program in the required time, or have dropped out. Try out ACST101 coz it's not that hard a unit and is a common finance type unit, but if you struggle to perform well in it (especially in the Techniques section) then I'd definitely not recommend Actuarial studies to you. Pretty much all Actuaries have an E4 in 3unit maths (and many in 4unit) so if you can't reach that threshold and are still shaky with maths, don't do it.
How did you go in MATH135 or any of the other mathematical/statistical units that you have done?