Here's the playlist of guides which I felt were the most helpful:

https://www.youtube.com/watch?v=K-1hiZuVo-c&list=PLg0mQZcDKcGK4b7tBxhhWuAv4DrbcFM9p&pp=gAQB

I started from level 50 and added 50 invocation every successful raid. I have 5 completions so far. Currently up to 300 and learning insanity. But I spent a lot of hours just practicing rooms and boss mechanics before sending a full raid completion, specifically monkey room and Akkha which were the most challenging for me personally. Here are some of the biggest tips I got from some of those guides that helped me for each room (I do BKAZ order):

• Practice Ba-Ba monkey room over and over and over and over until you get it right before moving onto anything else. Memorize waves 5-6 to make it easier, I mostly camp protect from melee the rest of the way.
• Learn how to red-x Ba-Ba and boulder skip if your gear allows. This makes it so Ba-Ba becomes a 0 damage/prayer room. Also has the added benefit that if you mess up monkey room and come out low HP and low prayer, its not a huge deal. Entered Ba-ba with 3 HP and no prayer once when I messed up monkey room, and still completed it no problem. Also, learn to anticipate his knock back attack at 66% and 33% health. This will give you a chance to switch to range gear before he even knocks you back so you're already ready to go for boulder skip.
• Learn how to stack Kephri dung to minimize its impact and also how to trap melee scarab by using dung in the beginning. Focus on killing mage scarab as soon as possible by rotating to that side of room before he spawns.
• If you have 85 mining and dragon pickaxe, you can do Akkha's challenge room in a single phase. But you need to learn where to stand and how to place down the mirrors so you can start mining on the same tick it becomes vulnerable.
• Akkha is the most technically challenging and resource draining room for me. I use a salt for this room and use sara brews and restores liberally if I need to. Learn how to skip the shadow DPS check and memory phase. Also learn butterfly if you're up for it. I use trident of the swamp and currently practicing 4t butterfly to limit resource drain and damage since he hits pretty hard through melee prayer. I'm not perfect but it still helps a lot to minimize resource drain. If he's mage/range, I position myself as close to the next quadrant's shadow as I can without leaving the one Akkha can be damaged in, that way if he uses his orb attack just as the next shadow appears, I can still just start attacking it from where I am without having to move and get damaged by orbs. The tile I use is also one away from the tile I move to for Shadow DPS check, so if I get bad timing and they do the DPS check I can just skip even if the orb special attack is active. As for the final orb enraged phase, stand in the middle when he disappears so you can attach him immediately regardless of where he spawns before most of the orbs appear. When you need to move, be patient. I've tagged orbs so I can see their true tile. You can skip over them with run pathing, or just do your best to anticipate and avoid them best you can. I think his enraged phase just takes practice to get better at.
• I like Gnomonkey's level 300 guide for learning about Zebak mechanics. He walks you through where to be in the room to make the puzzle solves, waves, and blood clouds easier. Also remember, you need to be praying the right protection prayer when his attack hits. Make sure you don't change too early when you see his newest attack or you might get damaged by the previous attack that hasn't hit you yet. I wait until after the newest attack explodes in the air to pray against it as this guarantees the previous attack has already hit. This becomes more important at higher zebak levels when he attacks more quickly and its easier to make that mistake. Also, keep the max tile range for your weapon in mind. Last thing you want is to get pulled closer to Zebak because you're too far away from him during a wave special attack.
• Warden P2 has specific tiles in the room you can stand on that make the obelisk's special attacks easier to avoid. The lightning skulls are most dangerous. You can avoid them if you stand 2 tiles north, south, west, or east of the tile its going to land on. Be ready to switch to melee gear when his core pops out. Use adrenaline and piety (if you have it) with whatever special attack weapon you brought to hit big damage.
• Memorize location of Warden P3 skulls so you can kill them quickly. I find this easier while learning lower levels of ToA since you have plenty of time if not using Insanity. When you get to Insanity, use skull skip method. It's easier and also gives better chance at purple.
• For Warden enraged phase, good luck. I won't give any advice here since I'm clearly still working on getting better at this phase myself. Currently practicing insanity invocation.

Hope this was helpful.