Calculator fucked me up.

No.11358163 ViewReplyOriginalReport
Bros, How can i recover from this?
Basically in all of "Highschool"(equivalent) they allowed me to use Pic related, even on Tests.

In 4 months i gotta take the hardest admission exam in my country with no calculators at all.
70 advanced Math questions, 20 "IQ" questions, 40 (physics, chem, bio) questions in 3.5 hours.
the last 60 are no biggie, but now i'm not able to do simple operations under 20 seconds (/ * + -)

How can i prepare for this? did i fucked up too bad?