I love the website englishgrammarsecrets.com. I think it is a great oplace to help your practice your English. These are three exercises for students from Survival and above. They help practive the Present Simple and Auxiliaries.
This activity practices using the auxiliary 'do'. It is very simple, but also very good;
This activity practices the Present Simple and also vocabulary. You need to choose the correct verb for each space.
This activity helps you practice the Present Simple. You need to match sentences to each other. It is simple, but it is good practice.