Suggestion 1:

Maintain a proper balance of sleep and nutrition. Like a marathon runner, one must maintain a pace that exudes endurance and tenacity. Much like a steady camp fire is fed a sustaining supply of wood, so must the individual feed one’s self with the proper rest and healthy fuel.

Suggestion 2:

Do as much work ahead of time as possible. Projects that are not yet fully defined by the instructor can be skimmed, to get a general idea of the knowledge that may be presented.

Suggestion 3:

Maintain a work-space. The classroom is virtual, but then again, you chose the environment for your own classroom in such a scenario, do you not? It should be the most comfortable, work-facilitating environment possible, without distraction and as free of all interference as possible.