Optima
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Start your error notebook.

Add screenshots of the questions you got wrong in your last mock. Even 5 is enough.

0 added · up to 6

Example screenshot
Q51 · Conc. HNO₃ is 75% by mass. Volume (mL) of solution containing 30 g HNO₃? Density 1.25 g/mL.
(1) 40 · your answer (2) 32 · correct (3) 45 (4) 55
The full question page, with the option you marked.
Windows Win + Shift + S · Mac Cmd + Shift + 4
Phone: open the portal in your browser (not the app), then Power + Volume Down