Elevate

Elevate is again one of the simple brain training games online. It is available on Playstore and though it's free, but has some in-app purchases. Elevate has a set of mind games that have different modules.

You will have to download each, play, and move ahead. Elevate is centered on reading, writing, speaking, and math. You can customize your training to focus on whichever areas you prefer.

Elevate is one of the best iq boosting brain games for kids in 2021 which also lets you track your progress to see how your skills are improving.