If you're not feeling better by tomorrow. You should see a doctor. If you're not feeling better by tomorrow, you should see a doctor.
You're not feeling better by tomorrow, you should see a doctor. which sentence has correct punctuation

The second one is the write one

If you're not feeling better by tomorrow, you should see a doctor.√

If you're not feeling better by tomorrow, you should see a doctor. (first)

Explanation: the if is needed at the start

they insisted that there was not enough time to learn everything.  

explanation:

if they were going to steal the answers that is simply because they insisted that there was not enough time to learn everything.  

the cost of attendance or coa is an approximate budget for the cost of attendance of the whole academic year. in order to calculate this, universities take into consideration many factors like room and board, tuitions and fees, books, transportation and personal expenses such as medicine, laundry, clothing. all these factors combined make up the final sum to the cost of attendance in each university.