The students may try to improve the grade of T1 or/and T2  on the exam date. 

Students must be in the room in the first hour to start doing the 1st test they want to do - either T1 or T2. 

After handling the solution of that test you may ask to see the other one (without leaving the room) and decide if you want to solve it or not. If not, you may leave the room. 

It is also possible to do the whole exam at once but then the grade will not be separated for Test 1 and 2. Be aware of this rule...