What is wrong with saying MUCH instead of "a lot." I used "a lot" for a while when I saw duolingo was using it but decided to use the correct vocabulary inserting "much" and it said I was wrong and had to use "a lot". As far as I'm concerned, using "much" is better English than "a lot".
I think leo is the verb form for I (yo), but when it placed after need (necesito) and want (quiero) it used its original form which is leer.
I read a book. - yo leo un libro.
I need to read a book. - yo necesito leer un libro.
I hope you understand. But I'm not an expert myself, so please correct me if I'm wrong.