It is very tempting to take shortcuts in tasks which allow you to reach your result faster, or if not faster, then perhaps with considerably less effort!
This is particularly true in tasks that require learning.
The problem with sacrificing effort is that the same task may come up later again and again. At each point in time, considerable effort must be made to reach the minimum level of understanding to complete the task. In many cases, the task may recur in slightly altered form in future (for example, if a legislation comes up, or a particular government policy changes).
Another approach is to do the task properly "first time round". Understanding clearly what the task is about, documenting any confusions (and grouping them into "confusions that must be resolved to resolve the task" and "open questions for future thought"will help to prioritise your attention) as well as references relevant to the task (collated for easy access) will be extremely useful not only to complete the task of time but also in reinforcing your understanding which will help resolve future similar assignments.
Be confident in questioning the things you don't understand. Document your confusions. Then resolve them and document the resolution. This way you will gain a confident understanding for completing your tasks.