Learn Swedish: Du stavar mycket bättre, men du måste öva uttalet lite mer. - You spell much better, but you must practice the pronunciation a little more.

Just like in English where you say much better and not more better, Swedish uses mycket to make a comparative stronger. You use mer to mean more of a noun, but mycket is used to emphasize an adjective that is already in its comparative form, like bättre.

Is it possible to say öva på uttalet instead of just öva uttalet?

Yes, both are perfectly fine and mean the same thing here. The verb öva (to practice) can take a direct object like uttalet, or it can be used with the preposition på. Using it without på is often slightly more direct, but in everyday speech they are completely interchangeable.

How do we figure out the gender of uttal to make it uttalet?

The word uttal (pronunciation) is a compound noun made from ut (out) and tal (speech). In Swedish compound nouns, the very last word always determines the gender. Since it is ett tal, the whole compound becomes ett uttal, making its definite form uttalet.

Why is it lite mer and not lite fler at the end of the sentence?