When you are taking an online preparation course, they start and end at your own convenience. You are the one who pays and schedules the lessons on your own time.
Yes, there are several options for online prep courses for the GRE. Kaplan Test Prep offers one such course for $749, and Princeton Review offers their online GRE prep course for $799. Both of those courses are conducted live, with personal instruction provided.
There are many options for GMAT prep courses online. One of the best and most trusted is www.knewton.com which also offers prep for other courses.
PMP prep course is a project manager provider course that you can get either online or by going to a college if you want more information you can go to pmcampus.com
Yes, Kaplan does offer a GMAT prep course. Depending on the type of course you take, whether it's online or on site, the cost starts at around $449.00.
There are many sites online that can give you great training on tax prep. I would recommend that you go to JacksonHewitt.com for help.
An ACT online preparatory course will improve your test scores on the ACT.
Yes most local education centers should offer SAT prep courses. Or if you prefer, you can take a prep course online. More information is available on the official SAT website.
According to the sat college prep board you can take the SAT prep course in May and September. If you would like to get it done faster you can do it anytime online. Here is a website to get you started, https://satonlinecourse.collegeboard.com/.../splashSchoolLogin.jsp.
I can't specifically say which course is most used as there are a huge amount available, however I would recommend taking a course from Princeton Review or Kaplan for online courses as those are the most well known. Source: http://www.ehow.com/how_4995276_gre-prep-courses.html
You can take a free prep course at http://www.gedforfree.com/ There is a fee for the test, which is $75, $15 for each of the five parts of the test. There are some online courses that cost anywhere from $100 to $1000, but the test is standard and so is the prep work, so there's no benefit in paying for a course you can get for free.
There are several ways you can get a Kaplan GMAT prep course. You can get a video course that lets you work on it whenever you want. There is also online courses with instructors in a virtual class. And finally you can arrange to have an instructor come to a classroom near to where you live. Check out the web page www.kaptest.com/gmat
There are a lot of PMP prep classes offered at http://www.cheetahlearning.com/. This website is a good place to prep for the PMP course because they have the highest audited pass rate for the last ten years. They have class locations all over that make this class easy to get to and complete. The classes start at a low price of $2365.00. They also have an accelerated PMP prep program that you can enroll in.