Thanks so much

is this web address correct? I cannot open it. maybe is there a problem on the website?

http://www.languagecoursesuk.co.uk/test/turkish_test.php

try this

For question 24, I think the answer should be

Araba kullanabilirim ama motorsiklet kullanamam

I can drive a car, but I can´t ride a motorcycle.

You correctly chose to make the second verb negative (because of ama).

The choice then becomes whether to use the definite (...amam = I can´t) or a negative possibility (....amayabilirim = I may not be able to)

I think in this question that the definite negative is the best answer. 

For question 25, the negative possibility (which you gave) is the best answer in my opinion  

A. Murat’ın doğum günü partisine gelecek misin?

Will you go to Murat´s birthday party?
B. Emin değilim. Gelemeyebilirim. Çünkü bu aralar çok yoğunum.

I´m not certain. I may not be able to come. Because I´m very tired at present.

Here the answer is not definite, because they might come if they do not feel very tired. By saying ´emin değilim´ (I´m not certain), the clue to help you has been given.

Click here to read a discussion about gelemeyebilirim.

Here are my thoughts on the 5 other questions I think you got wrong.

Question 32 

Bence bu yaştan sonra senin, her gün düzenli olarak spor yapmalısın

In my opinion, from your age onwards, you need to do some organised sport every day.

Question 35

Her sabah yataktan kalktıktan sonra, 10 dakika egzersiz yaparım.

Every morning, after getting out of bed, I do 10 minutes of exercise.

Question 38

Bu hafta sonu ne çalışacağım ne de spor yapacağım! Sadece dinleneceğim. Ali wa Ahmad ........huna*

This weekend, I will neither work nor do sport! I will just rest.

If you are saying that you will only rest on the weekend, then you must use the negative neither / nor (ne / ne de), rather than the words for both (hem / hem de)

*Unfortunately I have no idea what Ali wa Ahmad ... huna means. Is it Arabic?

Question 39

Ben beş yıl önce üniversitede okurken, o bir şirkette yönetici olarak çalışıyordu.

When I was studying in university 5 years ago, he was working as a business manager. 

Question 40

Eğer o anlaşmayı yapabilseydik, şirketimiz markette lider bir konuma gelırdı.

If we had been able to agree, our business would have become a market leader.

The clue here is that the subject of the second part of the conditional sentence is our business, not we. Therefore the suffix on the final verb must agree with the subject (3rd person singular, our business = it)

I see you have improved since the last time you took this test Nifrtity.

Hopefully Mavili can also see where she went wrong.

Maybe next time, if you remember all the corrections, you should get 40/40. 

I have also learnt some useful things while I was trying to help you with the correct answers. 

Can you also help me? 

Does Ali wa Ahmad .... huna mean something in Arabic?

PS I have just found this question on their Arabic-English test site

Hayır Henry, doğru cevap şöyle;

... senin, ... yapman gerek

This must be a mistake. Nothing is Turkish in this question.

Yes, that is definetely  in Arabic.

It says ;

Ali ve Ahmet  burada........... 

so the answer should be  "yaskununi" [oturuyor[lar] ]  

Someone correct me please if I am wrong. [as my Arabic is not as good as used to be ]

Ali wa Ahmad yaskunun Huna

means in English "Ali and Ahmed are lives here

Right answer in Arabic