Confusion with test csv file in kaggle competition

In the course lectures we used train_test_split function to break dataset into X_train , Y_train , X_test, Y_test but in kaggle competiton there is already a test.csv file with no Y_test so, how we have to check our model on X_test

You can split the data into 80:20 for training and validation.
You can use train_test_split from sklearn for this