With this useful modification, when you hover over a mob, an interface will appear in the upper left corner displaying its model, health scale, damage done and effects.
Damage Indicators Mod for Minecraft 1.13.2/1.12.2
This is really a critical feature that will help you in a variety of situations, and especially during a battle. Using Damage Indicators Mod you can reach a new level of the game.
Download Link: 1.12.2DamageIndicatorsMod_3.5.1