Remeber this is just for ArcEmu core tutorial....

1) Open Arcemu/trunk/src/arcemu-world/player.cpp

2) Use Ctrl+F 'Find' to find these sections of code. Replace where i Have placed a '###' with your new max skill cap.

To Edit Weapon Max Skill level
Code:
// force to be within limits
#if PLAYER_LEVEL_CAP==80
	Curr_sk = ( Curr_sk > ### ? ### : ( Curr_sk <1 ? 1 : Curr_sk ) );
	Max_sk = ( Max_sk > ### ? ### : Max_sk );
#else
	Curr_sk = ( Curr_sk > ### ? ### : ( Curr_sk <1 ? 1 : Curr_sk ) );
	Max_sk = ( Max_sk > ### ? ### : Max_sk );
#endif
To Edit max Profession Level (If your level cap is higher then 80 follow the direcions on the next box down)
For Max Level 80:
Code:
		{
			new_max = itr->second.MaximumValue;
			if (new_max >= ###)
				new_max = ###;
		}
		else
		{
			new_max = 1;
		}

		// force to be within limits
#if PLAYER_LEVEL_CAP==80
		if (new_max > ###)
			new_max = ###;
#else
		if (new_max > ###)
			new_max = ###;
#endif
If your Max level is higher then 80 then replace the section of code mentioned above (in your player.cpp file) with this code
(Replace the ### with the new max skill level as usual and the $$$ with your servers max level
Code:
		{
			new_max = itr->second.MaximumValue;
			if (new_max >= ###)
				new_max = ###;
		}
		else
		{
			new_max = 1;
		}

		// force to be within limits
#if PLAYER_LEVEL_CAP==80
		if (new_max > ###)
			new_max = ###;
#else
		if (new_max > ###)
			new_max = ###;
#endif

#if PLAYER_LEVEL_CAP==$$$
		if (new_max > ###)
			new_max = ###;
#else
		if (new_max > ###)
			new_max = ###;
#endif
This is for All skills
Code:
void Player::_ModifySkillMaximum(uint32 SkillLine, uint32 NewMax)
{
	// force to be within limits
#if PLAYER_LEVEL_CAP==80
	NewMax = ( NewMax > ### ? ### : NewMax );
#else
	NewMax = ( NewMax > ### ? ### : NewMax );
#endif

That's it. Recompile your Arcemu Core and you enter in game.. Enjoy...