While some may feel more comfortable with relying on Manhattan for both self-study and an online course, an argument can certainly be made for combining different sources. There are members here who used Manhattan and enrolled in a Knewton
online course, for example.
The key is to find the best fit for you
. If you truly feel that an online course will help you, then find one that meets your criteria. But there's also a chance that the MGMAT series
, along with some additional practice problems (OG, GMATClub tests
, etc.) will be enough for a solid score.
Here's a list of all GMAT course options for you:gmat-prep-course-reviews-discount-codes-78451.html