There is no place to do wudoo’ in the college; can she do tayammum?
Question

                I am a girl studying in a post-graduate college of information technology. I have a problem with praying, because the college is far away and I have to leave home early, at around 12 noon, and I get there at 1 p.m. Sometimes I lose my wudoo’, so can I do tayammum? Please note that there is no private place there where I can do wudoo’. Or is there another solution?.
Praise be to Allah.Prayer is an important 
    matter, and it is not permissible to be careless about performing it. Rather 
    it must be done regularly at the proper times, as Allaah says 
    (interpretation of the meaning): 
“Verily, As‑Salaah (the 
    prayer) is enjoined on the believers at fixed hours”
[al-Nisa’ 4:103]
“Guard strictly (five 
    obligatory) As‑Salawaat (the prayers) especially the middle Salaah (i.e. the 
    best prayer ‑ ‘Asr). And stand before Allaah with obedience [and do not 
    speak to others during the Salaah (prayers)]”
[al-Baqarah 2:238]. 
If a person can find water 
    and is able to use it, it is not permissible for him to do tayammum. 
    Concerning that, the Messenger of Allaah  (peace and blessings of Allaah 
    be upon him) said: “The prayer of one of you will not be accepted, in the 
    event of minor impurity, until he does wudoo’.” Narrated by al-Bukhaari 
    (6954) and Muslim (225). 
It is not permissible to do 
    tayammum unless there is no water available or there is the fear of harm if 
    it is used. Allaah says (interpretation of the meaning): 
“But if you are ill or 
    on a journey, or any of you comes after answering the call of nature, or you 
    have been in contact with women (i.e. sexual intercourse), and you find no 
    water, then perform Tayammum with clean earth and rub therewith your faces 
    and hands”
[al-Maa’idah 5:6]. 
Based on this, it is not 
    permissible for you to do tayammum when you are able to use water. You can 
    do wudoo’ inside the washroom, because there is nothing wrong with doing 
    wudoo’ there. And the one who fears Allaah, He will grant him a way out. 
And Allaah knows best.