Don’t know about any good online review courses, but many CLSA chapters run a weekly series of review courses from January until just before the April Exam date.
If you are taking the April exam, you are asking pretty late in the game. If you took a surveying class in your engineering degree, and if it were typical of the one class that is sometimes included in CE degrees, your exposure to surveying relative to what you need to know for licensure has prepared you for the LS about as well as having taken a statics class and a geology class would prepare one for the PE.
But not to worry. Since going to the all multiple-guess CBT format, it is now possible to guess your way into a LS license. If each question has 5 possible answers (a, b, c, d, e), you can typically eliminate 1 or 2 as not even close to right, and with even the minimal exposure to surveying that one might get with 2 years experience, can probably readily answer 20% of the questions without any analysis or calculations. That leaves 3 choices per question on about 80% of the exam. Since the cutoff score is typically around 50%, if you flat out had to guess at most of that 80%, you could use something like a 6-sided die to make your decision on each of those questions and stand a pretty good chance of passing.
If you’re just gearing up for the October exam or next April’s exam, then we could probably steer you in a more useful direction for study.