FINRA does not state how the 5 unscored pretest items are distributed; this simulator spreads them in proportion to section size.
Navigation is modelled on FINRA's PROCTOR® tutorial: Previous/Next, mark-for-review once an item is answered, and a review list of answered items.
The clock does not stop once started.
The real SIE reports an equated score on a 0–100 scale; passing is 70. Your raw percentage is not an equated score, and no raw count guarantees a pass.