Maths was my biggest problem during my degree. In engineering, of any discipline really, you have to master the essential mathematics. There's no point coming into engineering thinking "I'll be alright, I'll just avoid the maths stuff" because the maths, and of course, physics is unavoidable.
My background is Electrical & Electronic Engineering, but speaking with friends from Aston who have done Civil, Mech and Chem Eng, and looking at their work, the facility required with maths seems the same across the board.
And as my old maths professor (Bill Cox) used to say "I haven’t got a magic injection where I can inject all the formulae into your head - it only sinks in this practice and hard graft". How right he is too!
I strongly agree with GtE on his comments about how the maths level varies with function. The maths I'm using at the minute as a researcher quite frankly makes even my early undergrad maths as easy as 1+1!
All I’ll say is, don’t be afraid of tackling the maths. Just keep practicing it. Yes, you’ll make mistakes to start with – as did we all, but over time, you’ll improve. I’ll second the recommendation for the Stroud book, and also Advanced Engineering Mathematics by Kreyszig. But perhaps start with something a little less taxing.
The first book I’d recommend is Understanding Engineering Mathematics by Bill Cox. He’s the Prof. at Aston I mentioned earlier in the post. The book is aimed not only at the first year university engineering maths, but at the transition from school/college level maths to university level maths.
Anyway, good luck with your future studies and career.
eP.