Hello Future Astronaut!

According to me, I feel both are equally important. In order to pass exams, you need proper skills as well as knowledge in what you are doing. While you enhance your skills, you gain knowledge. And examinations, tests are best way to showcase your knowledge.

Here are some skills you should ace in for this field :

1. leadership skills
2. experience in piloting jet aircrafts
3. ability to use robotic arms
4. exceptional communication skills
5. good at multitasking
6. building core strength
7. having maintenance and repair skills

and much more!

Below are some examinations you need to consider in your path to becoming an astronaut:

1. After your 12th grade, you need to go for bachelor degree in any course from physics, chemistry, aeronautical, math, biology etc.
2. After focusing on your UG, you then have to go for post graduation and doctorate which acts as your specialization course in the course you chose.
3. Then after successful graduation, you will then have to sit for an examination held by NASA for recruitment for scientist and astronaut.
4. Or in order to join ISRO one needs to clear the Joint Entrance Exam which is held by the IITs.

good luck.