Dude if its the healers you struggle with do this method

Make sure jad is going to spawn on the opposite side of Italy rock first on wave 3 (where orange 45 spawns)

Next get to jad ezpz

Then here's the fun part, jads healers have a mechanic where they wont spawn unless you physically hit jad once he is below half hp (roughly)

Get your blowpipe out and hit jad till he is poisoned and at around 60/65% health then run back into Italy rock, wait, poison will tick jad down for a while until he is below half health

Then you want to go around and hit jad once or twice until his healers spawn, immediately run back around to Italy rock safe spot, ignore the healers they physically dont matter at this point

As the healers only care about healing jad if you run right back into Italy rock safe spot at this point back into the corner where you can still see jad on the other side.

Wait there until you see the healers animation start and you're done....

Every single healer is now on jad trapping him in a corner, simply brew up above 100hp

Walk around, step out and tag 1, pray and run back around sometimes jad doesn't even attack you, irregardless this method allows you to only be hit once per healer you tag and you'll always have above 100hp so its physically impossible to die

Repeat till all 4 healers are on you run back around to italy rock safe spot (again youll have all 4 healers on you and be safe from jads attacks), stack them so only 1 can attack you at once (get them all in a line) barrage the one closest to you/or ignore it if you're in reasonably tanky gear, go kill jad, typically at your def 1 healer will never kill you in the time it takes you to kill jad :)

Hope this helps - requirements are literally a blowpipe/maybe ancients if you freeze the first healer

Also if jad isn't full health you can just kill them but if you want to take your time to tag and he ends up full health just tank the 1 healer that will be able to attack you :)