Cognitive Testing
The efficiency of the work most people do is a combination of their ability to focus and think. Cognitive testing helps you optimize the second. Unfortunately, it can easily be the most time consuming part of a health tracking routine.
Tool Infobox 
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Scientifically Validated
quantified-mind.com/science Paper with refs including caveat that it is "not formal neuropsychological testing and is not diagnostic...consult a medical professional if you have any concerns about your mental health". Some tests have a early practice effect. Boring and even stressful. ~~~
N-back Common working memory task. Several implementations are available. Training may improve other WM tasks and therefore train IQ.[1]
Puzzles
More fun then the validated test above but probably useless.
Many many many available on smart phones.
Informal Games
Chess. lichess.org Most programs record moves even timestamps. Analysis programs though are based on computer analysis and will not give an analysis of human performance. Video Games. Fighting games can get very involved in players exact moves. Many other types are becoming E-Sports and should get or have analysis and coaching.
Training
Test your cognitive abilities and train a skill. Tying: Amphetype. Memorize facts and lexicon with flashcards: anki.
Background
how long it takes to open a smart phone, misspesslings wehn typing emails