After his talk with Dumbledore Max directly went to the library and made 50 clones and started to study all the curses there, including Dark magic.
While he was studying Dark magic he thought of Voldemort (If I were to only study Dark magic then I'll go crazy like Voldemort, so straining light magic with Dark magic will balance out both of it.)
While his clones were studying magic he was meditating and going through the new memories he unlocked. He noticed that there were innumerable jutsus, but he didn't mind it as he knew that a Hokage had access to all the Justus in the nation. He decided to learn some key justus that he needed to get stronger. He also noticed a few sealing techniques. So he decided to learn Fuinjutsu first.
He took a few blank papers to practice storage seal first, as he knew that he might use it pretty often. As he was practicing sealing, his clones started to practice one spell at a time, so one by one all the clones took a curse or charm and went out to practice in the Forbidden Forest.
As his training went on he didn't notice the time, so after practicing a few sealing techniques he got up and saw that it was 3:00 in the morning, he went to his quarters and slept.
In the morning he woke up pretty late, and he noticed that his food was already kept by his bed. He was pleased with how the house elf did their work diligently. He ate his food and decided that he better try out this new exercise method.
He teleported outside Hogwarts and applied a few seals on himself and made 50 clones and started to run. This was his new seal 'Gravity seal' which he learned last night.
He knew that he'll get all the fatigue from the clones with their experience, so he decided to use this method to train.
After running around the castle for like 10 times he was drenched in sweat and undid the shadow clone jutsu. As soon as the jutsu was undone he immediately feel down, but he actually had a smile on his face.
He was very happy, because he knew that this way of training yielded good results. After that he sat down beside a tree and meditated to recuperate.
After 15 minutes of resting, he went inside the castle to get some lunch. As he reached the dinning hall he saw Harry Potter and some of the teachers sitting in and having lunch.
Dumbledore who saw Max coming in said with a smile, "Well, come on in, Young Professor Argent. A seat is waiting for you here."
Max just went and sat and said to Dumbledore, "Thanks. Please, it's Max."
Minerva chuckled hearing this. She knew Max didn't like to be called professor. Snape just ignored him and kept on glaring at Harry.
Harry was curious to see a young man who kinda seemed like a senior student being called professor.
Dumbledore saw that Harry was confused so he told him, "Harry, this is Processor Argent. He'll be an assistant to our new DADA teacher, and he'll also teach you spells personally when you're done with your everyday classes."
Harry was surprised to hear that he'll be getting personally tutored by him, but his mood immediately feel recalling his last two years of DADA classes. All he remember was having fake teachers through out first two years, so he also wasn't expecting much.
Dumbledore looked at both Harry and Max then said, "Professor Argent, how about you start teaching Harry from tomorrow? Today, just spend some time together and get to know each other."
Max thought about it and nodded. Harry hearing this was happy, he already decided to test whether this Young professor was real or fake like the rest.
After finishing their lunch everyone went to their business. Harry followed out Max.
Max who saw Harry following him told him, "Hey, Harry, I'm Max. Max Argent. I heard you're quite a genius."
Harry hearing this was kinda embarrassed. He looked at Max and directly asked, "Professor, can you really do some curses or charms? I mean, my last two DADA professors kinda weren't up to the task. And you seen kinda young."
Max was surprised hearing Harry's question, but he understood as he had watched in TV Harry's DADA professors were.
As they both reached the Forbidden Forest, unknown to Harry a couple of Dementors were moving towards their direction. Max who noticed this said to Harry, "Harry, you know that it's rude to ask your teacher whether he's qualified to teach or not. But I'll give you a demonstration." As he said this he turned to Harry and pointed to his right and said, "Look there, Harry."
Harry turned and looked at pointed direction and noticed two black creatures floating towards them. As they reached closer and closer, he was feeling cold and felt his conscious getting blurry and felt like he heard a woman talking.
Max who saw they Harry was getting affected by these Dementors just used some ki in his hand as slammed at Harry's back. Harry immediate came to conscious and asked, "What are they, professor?"
Max smiled at him and said, "I'll tell you about that later. Now watch carefully here, Harry."
After saying that he simply lifted his hand and said, "[Expecto Patronum]." A bright like came out of his hand to which the Dementors seemed to be scared of as they flew away.
Harry who saw this was instantly surprised and asked with anticipation, "Professor, what was that? That was amazing."
Max smiled at him and said, "This is called Patronas charm. I learned it last night, so I still haven't mastered it. But still it's pretty handy when it comes to handling these bloody Dementors."
Max paused and then continued, "So from tomorrow you'll be practicing this charm. You sneak around a lot, right, so this will be useful when you get caught by a Dementor."
Harry was embarrassed when he heard that he was sneaking around. He looked at the young professor and said, "Professor, why are the Dementors placed near school?"
Max looked at Harry and said, "Someone escaped from Azkaban. Minister suspects that he might break in here. So I think they'll be around here for some time."
Harry was shocked. He looked at Max an apprentice, "Professor, do you think they might really break in here?"
Max ruffled Harry's head and said, "Don't worry. Even if anyone breaks in here, In Hogwarts we kinda have some of the best wizards."
Harry thought any Dumbledore and sighed. But there was something bothering him for some time, so he decided to ask it, "Professor, why me? I mean, why did Head Master suddenly arrange you to personally teach me?"
Max hearing this sighed and said, "Harry, there are some things which you're not suppose to know. If you were strong enough we don't mind telling you, but you're not ready yet. We all hope that you'll be ready when the time comes. I'm just here to teach you till then."
Harry was confused hearing this. He knew there was something wrong, he also knew that everyone around him always keeps on hiding some secret. But all he can do now is wait. But he was still happy to get a good DADA teacher. He then asked, "Then professor, can you teach me any practical charm, like, some easy ones."
Max smiled at him and started to slowly float and flew up. Max then looked at Harry and asked, "You know the Levitation charm, right?" Harry nodded, then Max continued, "Well, have you ever tried applying it on yourself?"
Harry nodded and said, "Professor, not only me, I heard that many people tried, but it took too much magic out of us, that's why nobody uses it like you."
Max actually used ki to fly, but he couldn't tell that to Harry, so he looked at him and said, "Ok, apply the spell only for your robes. Then try to move your robes with that it'll automatically move your body."
Hearing this Harry was surprised. He started to use the Levitation charm on his clothes. At first he wasn't able to move the right way. But after a couple of hours of practice he managed to move around slowly.