Like even simply questions like for e.g if Tom is 30 years old and his 3 times older than his daughter Michael Jackson how old is MJ? I could do that maybe off my head but i can't work those simple questions out… And then with methods, i struggle with the quadratic type questions…
There are some things which you can do immediately upon reading the worded problem.
1. Identify KEY words.
Some of this just gives away what type of problem it is.
Eg. Gradient of a line (differentiation!)
Find area covered by a graph (integration!)
Perpendicular (Linear graphs)
2. Zone in on the topic of the key word
If it's about gradients, what do I have to do in relation to differentiation? Do I just write an equation for dy/dx or (alternative method)
3. Find the correct solution.
4. Practice, practice, practice! Do more and more and eventually you'll become much better! Don't lose hope

(unfortunately, the old adage practice makes perfect applies in our everyday lives)