Brain Teaser *Identify the Superfluous (Unnecessary) Word from the sentence*

What are the actual facts?

The pencils were exactly identical.

The improvements to the property are clearly evident.

The students followed after the teacher to the classroom.

Make sure you return back the plate.

The event required prior planning for it to be successful.

My grandfather spent his retirement studying the past history of the Inca people.

He told me to reverse back the car.

My mum taught me the basic fundamentals of cooking.

I'm always mixing up the pair of twins.