You can fetch a lot through online tutions. Some students prefer taking online tutions as a lot of travelling time is saved also they dont have to face the tutor or the tutors scolding probably ;). There are a lot of websites providing a medium for online tutions. The rates are applicable per hour or monthly basis. The students pay you directly or you are paid some percentage of what a student pays (rest is kept by the website as service charge). Some may require minimum qualifications like BE degree etc. If you think you have time and you are really qualified for taking tutions you can go for this.

Here are some websites below you can go through :

Tutor.com
Is looking for tutors to join the live homework help program for assignments in Math, English, Science or Social Science from grades 4-12.College students are also eligible.Tutors can also take sessions privately for about $30/hour. A tutor can work for a maximum of 20 hours a week, and payments are sent once a month.A tutor has to download a program for the virtual classroom.

Universalclass.com
A teacher can create a virtual classroom online on the subject you are knowledgeable about using the tools provided. Teachers get 60% of the course fees for all students who enroll and US$5 for each certificate sold. Payments are sent once a month, after the account balance reaches US$50 .

Hodesiq.com
Provides live instruction for students in grades K-12 via the internet. Require certified experienced Maths and Reading teachers working from home anywhere in USA. Compensation is US$10/hour



Smarthinking.com
Requires part time online writing tutors to work between 6 to 20 hours per week. They can work from any location with a computer and internet access. The candidate should have relevant experience in teaching and a degree in English language.

Ehill.org
Tutors who Hold or are working on a college degree
Earned teacher certification

Limu.com
Get paid for teaching any professional, academic or hobby related subject. Teachers are paid a percentage of the fees they charge.

Homeworkhelp.com
Provide online tuitions or homework help to students. Payment once a month by check.

Homeworktutoring.com
Homework help required for engineering, history and law

Coursebridge.com
Offers courses on a variety of subjects. Qualified instructors are paid 55-70% of the registration fees paid by students. Instructors provide course material and evaluate student assignments by email. Cheques in US$ are sent by postal mail

Kidspan.com
Provides online tuitions.Teachers from all countries can apply. You have to specify experience and expected hourly teaching rate.