3.You may suddenly find that there is no way to stretch the little time you have left to cover all your obligations.
在that引导的宾语从句中，you have left 是定语从句修饰 the little time ，省略了关系代词。
to cover all your obligations 是stretch 目的状语；obligations：职责、责任。
Time is dangerous. If you don‘t control it， it will control you. If you don’t make it work for you， it will work against you. You must become the master of time， not the servant.
Study hard and play hard is an old proverb， but it sill makes sense. You have plenty of time for classes， study， work， and play if you use your time properly. It is not how much time you allocate for study that counts but how much you learn when you do study.
4.Study hard and play hard is an old proverb， but it still makes sense.
5.It is not how much time you allocate for study that counts but how much you learn when you do study. 动词count意思是：重要，有价值，起作用
强调句，正常语序It is not … but … that counts. 由于被强调部分过长，所以倒装。
例如：It is not what to read that counts but how to read.
Too much wasted time is bad medicine. The more time you waste， the easier it is to continue wasting time. Soon， doing nothing becomes a habit you can‘t break. It becomes a drug. When this happens， you lose your feeling of accomplishment and you fall by the wayside. A full schedule is a good schedule.
Some students refuse to hear the time message. They refuse to accept the fact that college life demands some degree of time control. There is no escape. So what‘s the next step？ If you seriously wish to get the time message， this passage will give it to you. Remember - it will not only improve your grades but also free you to enjoy college life more.
6.Remember-it will not only improve your grades but also free you to enjoy college life more.
Message 1.Time is valuable -control it from the beginning.
Time is today， not tomorrow or next week. Start your plan at the beginning of the term and readjust it with each new project. Thus you can spread your work time around a little.
Message 2. Get the notebook habit.
Go and buy a pocket-size notebook. There are many varieties of these special notebooks. Select the one you like best. Use it to schedule your study time each day. You can also use it to note important dates， appointments， addresses， and telephone numbers.
Keep it with you at all times.
Message 3. prepare a weekly study schedule.
The main purpose of the notebook is to help you prepare a weekly study schedule. Once prepared， follow the same pattern every week with minor adjustments. Sunday is an excellent day to make up your schedule for the following week. Write in your class schedule first .Add your work hours， if any. Then write in the hours each day you feel you must allocate for study. Keep it simple.
7.Once prepared， follow the same pattern every week with minor adjustments.
此句是祈使句，Once prepared作状语，完整的表达为：Once your weekly study schedule is prepared.
8.Then write in the hours each day you feel you must allocate for study.
Message 4.Be realistic.
When you plan time for these things， be realistic. Don‘t underestimate. Overestimate， if possible， so that emergencies that arise don’t hang you up . Otherwise your entire routine may get thrown off balance while you devote night and day go crash efforts.
Message 5.Make study time fit the course.
How much study time you schedule for each classroom hour depends on four factors：（1）your ability， （2）the difficulty of the class， （3）the grades you hope to achieve ，and（4） how well you use your study time. One thing， however， is certain： you should schedule a minimum of one hour of study for each classroom hour. In many cases， more will be required.
Message 6.Keep your schedule flexible.
A good schedule mush have a little give so that special projects can be taken care of properly. Think out and prepare your schedule each week and do not become a slave to an inflexible pattern. Adjust it as you deem necessary.