How do I show that 'took' happened in the past?
In ASL, verbs don't change their physical form to show tense. You use the exact same sign for 'take' and 'took'. To show the action happened in the past, you establish the timeframe at the beginning of your sentence using time signs like 'YESTERDAY', 'LAST-WEEK', or 'PAST'.
Can I use this sign for 'taking a test' or 'taking a class'?
No, this specific sign is used for physically taking an object. If you are talking about taking a test, taking a class, or taking up a new hobby, you would use a different ASL sign (often called 'TAKE-UP' or 'ADOPT'), which uses both hands pulling upward.
Does it matter which hand I use to sign 'took'?
You should use your dominant hand for this sign. If you are right-handed, reach out and pull back with your right hand while keeping your non-dominant hand relaxed. Consistency with your dominant hand helps make your signing clear and natural.