Is there any good textbook for theoretical economics mathematical modelling?
Your question seems a bit broad. What kind of “theoretical economics” are your reading?

Nevertheless, I infer from what you write that you need to start from the beginning with maths for economcis (and maths in general), (this is because of your comment not knowing when to use an exponent  and when to multiply.

Having said this, I would recommend:

“Essential Mathematics for Economic Analysis” by Hammond et al

This book starts at the basics and builds up mathematical tools to study economic ideas.

Having mastered this book, I would try

“The Structure of Economics” of Eugene Silberberg. This books is more advanced, but it is “economics with mathematics”, so having aquired the basic mathematical tools in the first book, this book focuses con economic models from a mathematical standpoint.