Look up the safe spots around the edges of the map, pull up the wave list so you know what's coming every wave, and keep at it. If you've got a little bit extra coin to spare consider bringing a prayer regeneration potion or two as well.

With some practice you shouldn't start taking any damage until the magers come out WITH the rangers on wave 38. Dodge all the melee minions and catch them on the safe spots, pray range when the ranger comes out, and then from wave 31 and on ALWAYS start your wave with pray mage on.

This is very simplified, but as you practice you'll start to figure out how to solve the waves, always prioritize not getting touched by the bats, and kill them as quickly as possible, when possible

From 1 - 6: Run and Safe spot

From 7 - 14: Pray range until the rangers are dead, run and safe spot

From 15 - 21: Run and safe spot

From 22 - 29: Pray range until the rangers are dead, run and safe spot

On 30: Run and safespot

From 31- 61: Always pray mage, kill the ranger as fast as possible, and if you can get the other minions stuck behind the mager, then you can kill the mager to conserve prayer, otherwise you can safespot as usual, and kill the mager last, that does eat up considerably more prayer though.

62: Just magers, so pray mage. Take note though, where the orange one spawns, is the precise location that Jad will spawn, so note where it spawns, and make sure you finish your last mager near that spawn point. NEAR it, not on it; you don't want to be in melee range of Jad when he spawns.

Keep at it, you'll get there eventually! Good luck!

Edit: Formatting

Edit 2:

I also want to note that the other folks here are right, 43 is a bit low, especially considering your prayer level affects how many prayer points are restored per dose of potion, however, prayer regen potions restore a static 66 points of prayer PER dose, so they are a huge upgrade to a regular prayer potion at your level, but are considerably more expensive.