To express the given sentence in past tense form, let's analyze the options:

• The original sentence is: "Aksa Thomas comes to attend the session so early."
• The sentence is in the present tense.

The task is to convert it into past tense. We will examine each option:

1. Aksa Thomas came to attend the session so early.
   This option is in the simple past tense, as it uses the past form "came" of the verb "come." This is the correct transformation of the original sentence into the past tense.
2. Aksa Thomas has come to attend the session so early.
   This sentence is in the present perfect tense, indicated by "has come." It mentions an action completed in the recent past but is not an expression of the simple past tense specifically.
3. Aksa Thomas may come to attend the session so early.
   The use of "may come" suggests a possibility in the future, not an action that occurred in the past, making this option incorrect.
4. Aksa Thomas will come to attend the session so early.
   The use of "will come" describes a future action, which is not aligned with expressing the past tense as required.

By the above analysis, only the first option correctly converts the sentence from present to past tense. Thus, the correct answer is:

This conversion involves changing the verb "comes" to its past form "came," which accurately reflects an action completed in the past.