During my pre-degree days,I think mathematics is  simple.
Just of resent, I noticed I can't solve same mathematics I use to before. What is the cause ?

Focus is one of the instruments to achieve a goal.
Your mind is sifted from it
$simp

Hmmm, you are right sir, the last time I practiced was 2018 and after seven years, what was I expecting anyway.

Practice maaa, definitely practice. 
Practicing make you think you are good at maths, not just maths but virtually anything and everything

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It happens to the best of us. Math is like a muscle.. if you stop using it, it gets rusty. But once you start again, it’ll come back stronger 🦾

Lack of practice is the cause

Trust me if you spend some few days refreshing your memory with time you will start solving maths easily