Also composers want to show 'contrast' between the sections so he/she makes B section sound very different from A section. That means notes/articulation/ techniques can be so different from A section. Composers introduce new set of techniques in the B section and therefore it usually creates difficulties.
Practise ONLY the difficult bits and those bits that your teacher corrected you in the last lesson. try to think this way: If you can do 1+1= 2 why do you do that everyday over and over again, right?
Always remember to have your lesson notebook in front of you while practising. Your teacher writes down the notes for YOU to read at home, not for him/herself.
Choosing materials to sightread is important. You should not 'sightread' your current pieces. Normally, it will be wiser to choose something that is two grades lower than your current grade.
When you practise sightreading materials at home, Remember ... give yourself at least 30 seconds to read the music. during the 30 secs, you need to
1) Check the clefs (sometimes they are both treble clefs!!)
2) Check the Key/Key signature/flats and sharps and look for any accidentals
3) Look for any repetitive phrases or patterns
4) Look for the main melody (sometimes it is on the Bass (left hand)!!
5) Clap the rhythm of the melody
6) Sing the melody line with correct rhythm quietly
7) Work out your own fingerings if there is none on the page. If a melody line goes higher, it is likely that you need to start with your right hand thumb. What about left hand? well, the same thing: If you see the bass line goes down, it is likely that you need to start with your left hand thumb.
8) After you have done the above, you should be ready to go!
9) Play slowly, For grade 1-3, examiners are not so picky on the tempo (how fast you play) so always do it slowly. For grade 4- 8, examiners are looking for more expressive stuff so you need to take the tempo marking into considerations!!
10) ONCE YOU START, DO NOT STOP!!! if you make mistakes, do not stop!! imagining you are playing with an orchestra or in an ensemble performance.