If you have set it up correctly then the max enchant level in the enchantment table should be 70. See enchantment mechanics for more specific details.
There must be 15 bookshelves around the enchanting table in order to obtain the maximum enchantment level of 30.
How to make enchantment table max. When a bookshelf is placed next to an enchanting table with one block of air in between it increases the maximum enchantment level. In the crafting menu you should see a crafting area that is made up of a 3×3 crafting grid. To achieve maximum enchant while still being able to access the enchanting table requires 30 bookshelves as shown in the image below.
There should be 15 bookshelves on each level and there should be 2 tiers. When making an enchanting table it is important that the book diamonds and obsidian are placed in the exact pattern as the image below. To make an enchanting table place 1 book 2 diamonds and 4 obsidian in the 3×3 crafting grid.