Incone suppirt and working

Can you tell me how income support will work out my earnings , if i work for 2 hours a week for 4 weeks in feb earning £8 per hour , and again in may and june .I have applied to work with my daughters school standing in on exams but its only 3 months in the year .I was told they would work it out over the year Thanks Debbie ..Also my daughter is 16 in may and ive recieved a letter about p.i.p what do i do next ? should i apply for p.i.p ? Also she has gone down a year in school and is year 10 instead of year11 so does she still qualify for p.i.p at 16 ..