High schoolers and adults who are baptized Catholics, but have not received any or all of the following sacraments:

Penance
First Holy Communion
Confirmation

are strongly encouraged to complete their sacramental initiation in order to participate fully in the life of the Church and take advantage of sanctifying grace necessary for eternal salvation.  

The method of formation for these sacraments may be determined on a case-by-case basis, but is typically accomplished by attending the RCIA program at Sacred Heart.  Penance and First Holy Communion are not bound by the liturgical calendar, however, Confirmation of baptized Catholics is provided by the Diocese of Joliet in the weeks following Easter Sunday.  The Bishop is the ordinary minister of Confirmation, and reception of the sacrament is therefore limited to the Diocesan calendar.  

Penance

Baptized Catholics past the age of reason (seven years old) have accountability to God for their sins.  Confession of sins to a priest is the method by which Jesus Christ arranged for His grace to absolve, purify, and strengthen the soul on the journey to its final end -- eternal life with God.  The Church infallibly teaches that an individual who dies in a state of unrepentant mortal sin is not able to receive eternal life in heaven, due to the absence of sanctifying grace.  The sacrament of Penance restores sanctifying grace to the soul, and re-establishes friendship with God.  

Holy Communion

The Eucharist is "the source and summit" of the Catholic faith, through which an individual receives the Body and Blood, Soul and Divinity of Christ, along with all the graces and merits of that action.  Jesus speaks to our hearts clearly in the Gospel of John when He states: 

“Amen, amen, I say to you, unless you eat the flesh of the Son of Man and drink his blood, you do not have life within you."  (John 6:53)

Opting not to participate in Christ's unparalleled gift of Self is a danger to one's own salvation.  The Church requires that Catholics receive Holy Communion at least once a year, at Easter, however, the Church makes Communion accessible on a daily basis.  

Confirmation

Confirmation is the sacrament by which the soul anointed by the Holy Spirit at baptism enters spiritual "adulthood".  Traditionally, Confirmation makes an individual a "soldier of Christ", reflecting the reality that the road to salvation involves conflict with and interference from the "murderer from the beginning," Satan.  Through the strengthening of particular gifts which the Holy Spirit wills for an individual's role in the Body of Christ, that person is better prepared to fulfill the will of God, which leads to authentic happiness in this life, and eternal bliss to come.  Although it is not a sacrament necessary to salvation, opting not to receive deprives the soul of the help of grace which is necessary to evade the snare of evil and every man's inclination to sin.