Fill in the blank with the suitable adverbs from the given alternatives.

There is no way of succeeding in exams _______ thorough practice.

without

The suitable adverb to fill in the blank is: without.

Here's why:

• Apart from implies the existence of other ways, which is not the intended meaning.
• Unless expresses a condition for success, making it less suitable than "without" which directly indicates the absence of an essential element.
• Hence implies a consequence or conclusion, which doesn't fit the context of the sentence.
• Without clearly and directly conveys the absence of thorough practice as the reason for not succeeding in exams.