My advice is to fly as frequently as you can. You will need many fewer hours if you do a lesson every day rather than only flying once per month.
Next, get on with the exams - most schools want you to have passed air law and human performance before solo, so don't let this hold you up. Be aware of the new exam regime that starts in September.
Read up on the next flight exercise before you arrive at the school. This will make it much easier to ask sensible questions during the pre-flight briefing. If you don't get a decent pre-flight briefing, find another school.
Don't worry about feeling sick. I have only had two incidences of students feeling unwell (on non-aerobatic flights) in 600 hours of instruction. Eat well before flight and look out of the window. If you do feel unwell, your instructor should be ready to deal with it - I keep a bag under my kneeboard just in case.
Make it clear that you are starting your PPL when you do your trial lesson. The instructor is less likely to treat it as a mere joy ride and you can get ex 4.1 done.
Enjoy the experience.
